Complex sentence: Hartsock's chute became entangled in a tree and as he dangled in mid air a German soldier came across him and was about to kill him until he was cut down by rifle fire.
Split into simpler sentences: Hartsock's chute became entangled in a tree and as he dangled in mid air a German soldier came across him. The German soldier was about to kill him until he was cut down by rifle fire.