Complex sentence: The Sutton to Wimbledon proposal utilises the existing Tramlink line between Wimbledon and Morden Road, but the cramped terminus inside Wimbledon station is barely adequate for its present function.
Split into simpler sentences: The Sutton to Wimbledon proposal utilises the existing Tramlink infrastructure between Wimbledon and Morden Road stop. The cramped tram terminus inside Wimbledon station is barely adequate for its present function.