Corrected version:

No Errors.

Improved version:

The two maps depict the state of a university campus before and after its construction, covering the timeframe from 2010 to the present. 

Corrected version:

Overall, there has been a massive change in the university campus, including student accommodation, a lake, a science building, and student facilities, all without harming the environment.

Explanation: 

The verb "has been" should be used instead of "is" to indicate that the change has occurred over a period of time. Additionally, "including" is a more appropriate word choice than "such as" to introduce the examples.

Improved version:

The university campus has undergone a significant transformation, encompassing the addition of student accommodation, a lake, a science building, and student facilities, all while prioritizing environmental preservation. 

Corrected version:

Turning to an unchanged area, in 2010 there was a lake in the centre of the university. On the east side, there were shops, and behind them, there was a restaurant.

Explanation: 

"University" should be capitalized as it refers to a specific institution. "On" is a more appropriate word choice than "in" to indicate the location of the shops. The pronoun "them" is used to refer back to the plural noun "shops."

Improved version:

In terms of unchanged areas, in 2010 there was a central lake within the university grounds. On the eastern side, there were shops, with a restaurant located behind them. 

Corrected version:

On the north side, there was a university office, and opposite the university office, there was a teaching block for arts and science. Across the road, there was student accommodation.

Explanation: 

"On" is a more appropriate word choice than "in" to indicate the location of the university office. The phrase "teaching block" should be preceded by the article "a" to indicate that there is only one block. The phrase "for arts and science" clarifies the purpose of the teaching block. The phrase "across the road" is used to indicate the location of the student accommodation.

Improved version:

The northern side housed the university office, while opposite this was a teaching block for arts and sciences. Student accommodation was situated across the road. 

Corrected version:

Turning to the pre-constructed area, the teaching block was reconstructed to create separate science and arts buildings. On the north side, the university offices were replaced with a science building.

Explanation: 

The phrase "the pre-constructed area" is used to refer to the area that was already built before the changes. The verb "was" is used instead of "is" to indicate that the reconstruction occurred in the past. The phrase "to create" is added to clarify the purpose of the reconstruction. The word "and" is used to separate the two separate buildings. The phrase "a science building" is used instead of "science building" to indicate that there is only one building. 

Improved version:

Moving on to the pre-constructed area, the teaching block underwent reconstruction, resulting in the creation of separate science and arts buildings. In the north, the university offices were replaced by a science building. 

Corrected version:

The student accommodation on the south side was replaced with accommodation on the west side. One student accommodation is still there on the west side. The lawn and seating area were removed. 

Explanation: 

The student accommodation" is used instead of "student accommodation" to indicate that specific accommodations are being referred to. "On" is used instead of "in" to indicate the location of the accommodations. The verb "was" is used instead of "is" to indicate that the replacement occurred in the past. "One student accommodation" is used instead of "one student accommodation" to indicate that there is only one. The verb "were" is used instead of "is" to indicate that the removal of the lawn and seating area occurred in the past.

Improved version:

Student accommodation on the south side was relocated to the west, with one remaining student accommodation facility still present. The lawn and seating area were removed.