Complex sentence: Pilots on the Empire Training Scheme at Wheaton Aston received refresher and night training on Airspeed Oxford aircraft before being posted out to an Operational Training Unit with the training extended to foreign as well as domestic aircrews.
Split into simpler sentences: Pilots on the Empire Training Scheme at Wheaton Aston received refresher and night training on Airspeed Oxford aircraft before being posted out to an Operational Training Unit. The training extended to foreign as well as domestic aircrews.