Complex sentence: Hinckley has one high performance Gymnastics Club: based at Clarendon Park, in its 30 years of existence it has never failed to have a number of its members competing for their home nations or for Great Britain.
Split into simpler sentences: Hinckley has one high performance Gymnastics Club based at Clarendon Park. In its 30 years of existence, it has never failed to have a number of its members competing for their home nations or for Great Britain.