Complex sentence: In 1944, after his brother in the RAF had been killed, he volunteered for military service, but when the army put him in a military band he shot himself in the foot to get back to civilian life.
Split into simpler sentences: In 1944, after his brother in the Royal Air Force had been killed, he volunteered for military service. When the army put him in a military band he shot himself in the foot to get back to civilian life.