Complex sentence: Both men enlist in the United States Army Air Forces where Foxy is the instructor at an aerial gunnery school and confronting Jon, now a "Flying Sergeant" student, makes his life miserable, trying to force the former policeman to resign.
Split into simpler sentences: Both men enlist in the United States Army Air Forces where Foxy becomes the instructor at an aerial gunnery school. He makes life miserable for Jon, now a "Flying Sergeant" student, trying to force the former policeman to resign.