Complex sentence: On 7 September 1940, Hull was shot down and killed during a dogfight over the London area; his aircraft crashed in the grounds of Purley Boys' High School in Purley, Surrey.
Split into simpler sentences: On 7 September 1940, Hull was shot down and killed during a dogfight over London. His aircraft crashed in the grounds of Purley Boys' High School in Purley, Surrey.