Complex sentence: Patrick died in an aeroplane crash while in the Royal Flying Corps on 19 October 1917, aged 18; he was based at Waddington, Turnhouse and Midlothian.
Split into simpler sentences: Patrick died in an aeroplane crash while in the Royal Flying Corps on the 19th October 1917, aged 18. Patrick was based at Waddington, Turnhouse and Midlothian.