Complex sentence: Bicycles were phased out in 1975 and the Police put more cars and motorcycles into service, the Police Air Wing also became operational in 1975 following the purchase of two single-engine aircraft.
Split into simpler sentences: Bicycles were phased out in 1975 and the more cars and motorcycles were put into service. The Air Wing also became operational in 1975 following the purchase of two single-engine aircraft.