Complex sentence: The club was told by the United Counties League that if a number of alterations were not completed by end of March 2010 they would be relegated, including a stand for 100 spectators and alterations to the pitch fencing and hard standing.
Split into simpler sentences: The club was told by the United Counties League that if a number of alterations were not completed by end of March 2010 they would be relegated. These included a stand for 100 spectators and alterations to the pitch fencing and hard standing.