Complex sentence: This was formerly a highly desirable residential area before falling out of fashion and being taken over mostly for office space and student accommodation, however recent high-class residential developments there have made living in the area much more appealing.
Split into simpler sentences: This was formerly a highly desirable residential area before falling out of fashion and being taken over mostly for office space and student accommodation. However, recent high-class residential developments there have made living in the area much more appealing.