Corrected version:

There is little room for doubt that the history subject is important in every school, but nowadays other subjects are also paramount.

Explanation:  

The error in the original sentence is the missing article "the" before "history subject." The corrected sentence includes the article to make it grammatically correct.

Improved version:

There is little doubt that the study of history holds great importance in every school. However, it is crucial to recognize that other subjects have also gained paramount significance in modern times. 

Corrected version:

 History is one of the most common subjects in schools.

Explanation: 

The error in the original sentence is the missing article "of" after "one." The corrected sentence includes the article to properly indicate that history is one among many subjects.

Improved version:

History stands as one of the most commonly taught subjects in schools. 

Corrected version:

In this modern time, a large number of people are busy with their work, so they cannot teach others about history.

Explanation: 

The error in the original sentence is the lack of a coordinating conjunction or punctuation to separate the two independent clauses. The corrected sentence adds a comma and the coordinating conjunction "so" to properly connect the clauses.

Improved version:

Nevertheless, due to the fast-paced nature of modern life, a significant number of individuals find it challenging to dedicate sufficient time to teaching historical knowledge.

Corrected version:

This subject tells about various past century knowledge.

Explanation: 

The error in the original sentence is the incorrect verb form "tell" instead of "tells" to match the subject "this subject." The corrected sentence uses the appropriate verb form.

Improved version:

This subject encompasses a wealth of knowledge spanning various past centuries, providing invaluable insights into our collective history. 

Corrected version:

In this modern world, the internet plays a vital role in people's lives.

Explanation: 

The error in the original sentence is the incorrect use of the word "role." The corrected sentence uses the correct form "plays a vital role" to indicate the active involvement of the internet.

Improved version:

In today's interconnected world, the internet plays an indispensable role in the lives of people worldwide. 

Corrected version:

It has been found that a large number of people do not like history. 

Explanation: 

The error in the original sentence is the incorrect use of the past tense "was found" instead of the present perfect tense "has been found" to indicate a past action with present relevance.

Improved version:

Consequently, a considerable number of individuals now turn to digital platforms to gain a deeper understanding of history.

Corrected version:

They find it boring because history is all about dates.

Explanation: 

The error in the original sentence is the incorrect use of a period between the two sentences. The corrected sentence removes the period and uses a conjunction "because" to properly connect the sentences.

Improved version:

Regrettably, a substantial portion of the population tends to find history mundane and uninteresting. 

Corrected version:

In schools, students crammed the dates without understanding, but on the internet, there are many websites like YouTube.

Explanation: 

The errors in the original sentence include the incorrect use of a comma before "but" and the incorrect use of the preposition "in" before "the internet." The corrected sentence includes a comma after "understand" and replaces "in" with "on" to indicate the platform of the internet.

Improved version:

Often perceived as a mere collection of dates and events, it fails to engage and captivate students.

Corrected version:

Now, people understand history through animation and movies.

Explanation: 

The error in the original sentence is the incorrect use of the possessive pronoun "their" before "history." The corrected sentence removes the possessive pronoun to indicate a general understanding of history.

Improved version:

Fortunately, with the advent of the internet, individuals now have access to a multitude of resources that utilize animation and movies to make history come alive. Websites such as YouTube have become invaluable tools for comprehending historical events and narratives. 

Corrected version:

In today's world, science and technology are also important because technology is rapidly changing.

Explanation: 

The errors in the original sentence include the incorrect spelling of "today's" and the incorrect verb form "are rapidly changes" instead of "is rapidly changing." The corrected sentence uses the correct spelling and verb form.

Improved version:

In the contemporary era, the significance of science and technology cannot be overstated. 

Corrected version:

 Now, a large number of people have different lifestyles and choices.

Explanation: 

The errors in the original sentence include the lack of a coordinating conjunction or punctuation to connect the two sentences. The corrected sentence adds a comma and the conjunction "and" to properly join the sentences.

Improved version:

Rapid advancements in technology have shaped various aspects of our lives, leading to diverse lifestyles and choices. 

Corrected version:

In this era, science is also important because a large number of people become scientists, doctors, etc.

Explanation: 

The errors in the original sentence include the incorrect verb form "are" instead of "is" to match the singular subject "science" and the lack of the plural form "scientists" instead of "scientist." The corrected sentence uses the appropriate verb form and plural noun form.

Improved version:

Consequently, science holds tremendous importance in society today, attracting many individuals to pursue careers in scientific fields, medicine, and beyond. 

Corrected version:

History tells about various countries, knowledge, and a great many people who went abroad.

Explanation: 

The error in the original sentence is the missing relative pronoun "who" before "went abroad" to properly connect the clause. The corrected sentence includes the pronoun to clarify the relationship between people and their act of going abroad.

Improved version:

History serves as a conduit for understanding the rich tapestry of different countries, cultures, and peoples. 

Corrected version:

 History also tells about other countries, currencies, and capitals of all countries.

Explanation: 

The error in the original sentence is the missing plural form "currencies" instead of "currency." The corrected sentence uses the correct plural form to match the list of items.

Improved version:

It sheds light on the intricacies of foreign nations, including their currencies and capitals. 

Corrected version:

A large number of people are interested in the science subject because it is all about our planet.

Explanation: 

The error in the original sentence is the missing article "the" before "science subject." The corrected sentence includes the article to make it grammatically correct.

Improved version:

It is worth noting that a significant number of individuals possess a keen interest in the subject of science, given its ability to unravel the mysteries of our planet and the natural world. 

Corrected version:

In conclusion, it is generally believed that all these subjects are important in people's lives.

Explanation: 

The error in the original sentence is the incorrect use of "these all" instead of "all these" and the missing apostrophe in "people's." The corrected sentence rearranges the words and includes the apostrophe for possessive form.

Improved version:

In conclusion, it is widely acknowledged that all these subjects bear substantial importance in the lives of individuals. 

Corrected version:

In my opinion, I believe that history is not important because individuals can obtain knowledge about the past through the internet, and science and technology are paramount in this era.

Explanation: 

The errors in the original sentence include the incorrect word "opine" instead of "opinion," the incorrect phrase "individuals of obtain" instead of "individuals can obtain," and the lack of a comma between clauses. The corrected sentence uses the appropriate words and includes a comma to properly structure the sentence.

Improved version:

Nevertheless, from my perspective, the accessibility of historical knowledge through the internet diminishes the significance of history, while the rapid advancements in science and technology make them paramount in our present era.