Complex sentence: Towards the end of 1963 a major overhaul of the Auster took place, the club also modified the aircraft to accept a Continental O-200 engine, replacing the Blackburn Cirrus Minor engine which had become aged.
Split into simpler sentences: Towards the end of 1963 a major overhaul of the Auster took place. The club also modified the aircraft to accept a Continental O-200 engine, replacing the Blackburn Cirrus Minor engine which had become aged.