Corrected version:

The two pictures compare changes in the university sports centre before and after the development. 

Explanation: 

Changed "are compared" to "compare" to make the sentence grammatically correct.

Improved version:

The two pictures provide a comparison of the changes made to the university sports centre before and after its development. 

Corrected version:

Overall, the sports centre has witnessed spectacular changes. Two dance studios, a leisure pool, two changing rooms, a sports shop, and a cafe have been built without affecting the 25-meter pool.

Explanation: 

Added a period after "spectacular changes" to separate it into its own sentence. Added a period after "pool" and capitalized "Two" to start a new sentence. Changed "are built" to "have been built" for proper verb tense agreement. 

Improved version:

Overall, the sports centre has undergone significant and impressive transformations. Notably, the addition of two dance studios, a leisure pool, two changing rooms, a sports shop, and a café have been completed without any alterations to the existing 25-meter pool.

Corrected version:

The most noticeable development is the construction of two separate changing rooms, one for sports and one for a cafe.

Explanation: 

Changed "room" to "rooms" to match the plural subject. Added "one for" before "sports" and "one for" before "a cafe" for clarity and correct sentence structure.

Improved version:

One of the most noticeable developments is the creation of two separate changing rooms, one designated for sports activities and the other for the café. 

Corrected version:

 The sports shop is constructed on the left-hand side as you enter the sports centre, with a large changing room behind it.

Explanation: 

Changed "and" to "with" to show that the large changing room is behind the sports shop, not a separate construction.

Improved version:

The sports shop has been strategically placed on the left-hand side upon entering the sports centre, with a spacious changing room situated directly behind it. 

Corrected version:

The reception is situated at the front of the entrance, and a second changing room is built to the east of the reception. 

Explanation: 

Added "the" before "front" for proper article usage. Added "a" before "second changing room" for clarity and correct sentence structure.

Improved version:

The reception area remains in its original location at the front entrance, and a second changing room has been constructed to the east of the reception area. 

Corrected version:

Another major development is the construction of a leisure pool to the west of the 25-meter pool.

Explanation: 

Changed "25-meters" to "25-meter" for correct hyphenation.

Improved version:

Another significant change is the construction of a leisure pool, positioned to the west of the existing 25-meter pool. This addition provides a new and refreshing option for recreational activities. 

Corrected version:

An outdoor court is converted into a sports hall that is situated to the north of the cafe.

Explanation: 

Added "a" before "sports hall" for correct article usage.

Improved version:

Furthermore, an outdoor court has been transformed into a fully functional sports hall, which now stands to the north of the café. This conversion allows for a more versatile and adaptable space for various indoor sports activities. 

Corrected version:

The two dance studios are constructed west of the sports hall.

Explanation: 

Removed "to" before "the west" for smoother sentence flow.

Improved version:

Adjacent to the sports hall, two dance studios have been erected to the west, providing dedicated areas for dance and movement practices.

Corrected version:

It can be seen from the maps, the gym has expanded and the outdoor courts were demolished.

Explanation: 

Changed "had expanded" to "has expanded" for correct verb tense agreement. Changed "was demolished" to "were demolished" for proper verb tense agreement.

Improved version:

From the visual representations, it can be observed that the gym has undergone expansion, offering more space and facilities for fitness enthusiasts. Conversely, the outdoor courts have been removed entirely, making way for the construction of the sports hall and dance studios.

Corrected version:

In addition, the reception, seating, and 25-meter pool remain unchanged.

Explanation: 

Added commas after "reception" and "seating" for correct punctuation.

Improved version:

It is worth noting that the reception area, seating arrangements, and the 25-meter pool have remained untouched throughout the entire development process.