Complex sentence: At the end of the 2012--13 season, Sporting Khalsa redeveloped their ground: changing the size of the pitch, building a new stand, creating new changing rooms and renovating the outside of the pitch & clubhouse.
Split into simpler sentences: At the end of the 2012--13 season, Sporting Khalsa redeveloped their ground. Changing the size of the pitch, building a new stand, new changing rooms, and renovating the outside of the pitch & clubhouse.