Complex sentence: Also in the 1960s, Wroughton became host to Westland helicopters, but its life as an RAF installation ended by 1972, when the Royal Navy took over-largely because the RN took over responsibility for servicing all military helicopters.
Split into simpler sentences: Also in the 1960s, Wroughton became host to Westland helicopters. Its life as an RAF maintenance unit ended by 1972, but the Royal Navy took over-largely because the RN took over responsibility for servicing all military helicopters.