Complex sentence: When he was 16, he enrolled in mechanical engineering at the University of Alberta, but when war broke out he quit to enlist as an infantryman in the Canadian Army, and served with the 196th Western Universities Battalion for one year as a company clerk.
Split into simpler sentences: When he was 16, he enrolled in mechanical engineering at the University of Alberta, but when war broke out, he quit to enlist as an infantryman in the Canadian army. Punch was part of the 196th Western Universities Battalion where he served for one year as a company clerk.