Complex sentence: He was stationed at Chateauroux, which was abandoned by its French personnel on 17 June 1940, upon which Henneberg evacuated to England, reaching it via Bourdeaux with three other pilots-this was the only Polish evacuation from France to England by plane.
Split into simpler sentences: He was stationed at Chateauroux, which was abandoned by its French personnel on 17 June 1940, upon which Henneberg evacuated to England, reaching it via Bourdeaux with three other pilots. This was the only Polish evacuation from France to England by plane.