Corrected version:

"The provided pie charts depict the number of journal articles read per week by all students, PhD students, and junior lecturers at an Australian university."

Explanation: 

The error in this sentence is the use of "lectures" instead of "lecturers," which is the correct term for academic staff members. Additionally, "university" should be written in lowercase as it is not a proper noun in this context.

Improved version:

"The provided pie charts offer a comprehensive visual representation of the weekly reading habits of students, categorised into three distinct groups: all students, PhD candidates, and junior lecturers at an Australian university."

Corrected version:

"In general, it is evident that 67 percent of all students read 1 to 5 journal articles, while just over one-tenth of all students read 12 or more journal articles per week."

Explanation: 

The error here is in the phrase "the one-tenth of all student." It should be "one-tenth of all students." Additionally, "12 plus" should be corrected to "12 or more."

Improved version:

 "In a general overview, it becomes apparent that approximately two-thirds of all students engage in a weekly reading routine of 1 to 5 journal articles, while slightly over one-tenth of the entire student population delves into the realm of 12 or more journal articles per week."

Corrected version:

"In addition, one-fifth of all students read 6 to 11 journal articles per week."

Explanation: 

The correction involves adding a hyphen to "one-fifth" to make it a compound adjective. Additionally, it should be "journal articles" (plural) instead of "journals articles."

Improved version:

"Additionally, one-fifth of all students allocate their weekly reading time to peruse 6 to 11 journal articles."

Corrected version:

"A thorough analysis of the figures reveals that the highest number of PhD students read 12 or more articles (80%), whereas fewer than one-quarter of junior lecturers read 12 or more articles."

Explanation: 

The error here is using "adolescents" instead of "students" for PhD students. Additionally, "12plus" should be corrected to "12 or more." "Junior lectures" should be "junior lecturers," and "under" should be replaced with "fewer than" for clarity.

Improved version:

 "A meticulous analysis of the data exposes a striking contrast between the reading patterns of PhD students, where a significant 80% consume 12 or more articles weekly, and junior lecturers, of whom fewer than a quarter exhibit a comparable level of scholarly engagement."

Corrected version:

"Notably, three-quarters of total junior lecturers read 6 to 11 articles per week, and a small proportion of junior instructors read 1 to 5 articles.".

Explanation:

 The correction involves changing "three-quarter" to "three-quarters" to indicate a plural fraction correctly. "Junior lectures" should be "junior lecturers," and "juniors instructors" should be "junior instructors."

Improved version:

"Noteworthy is the fact that three-quarters of all junior lecturers dedicate their reading time to exploring 6 to 11 articles per week, while a mere fraction of junior instructors focus their attention on 1 to 5 articles."

Corrected version:

"Turning to PhD students, 15% of PhD students read 6 to 11 articles, and 5 percent of PhD students read 1 to 5 articles."

Explanation: 

"Turning to PhD students, 15% of PhD students read 6 to 11 articles, and 5 percent of PhD students read 1 to 5 articles."

Improved version:

"Shifting our focus to the realm of PhD students, it is revealed that 15% among them dedicate their valuable time to digesting 6 to 11 articles, while a modest 5% of PhD candidates opt for the lighter reading load of 1 to 5 articles."

Corrected version:

"To sum up, the figures offer a comprehensive overview of the students who read journal articles in three distinct categories. The highest proportion of all students reads 1 to 5 articles. PhD students and junior educators who read 1 to 5 articles constitute a very small proportion. These findings shed light on the proportion of students who read journal articles per week."

Explanation: 

The corrections include changing "adolescents" to "students" for consistency and using "reads" instead of "read" to agree with the singular subject "proportion" in the second sentence. The third sentence combines "PhD adolescents" and "junior educators" into "PhD students" for clarity and conciseness.

Improved version:

"To summarise, the figures provide a comprehensive insight into the reading preferences of students across three distinct categories. The dominant trend is the preference for reading 1 to 5 articles weekly among all students. PhD students and junior educators who gravitate towards the 1 to 5 articles category constitute a relatively minor fraction. These findings illuminate the nuanced landscape of students' weekly reading habits."