Complex sentence: He then headed west and played college football at the University of Idaho, where he graduated in 1940 and became a high school teacher and coach in Bonners Ferry, and then a year at Lewiston High School.
Split into simpler sentences: He then headed west and played college football at the University of Idaho, where he graduated in 1940. Knap became a high school teacher and coach in Bonners Ferry, and then spent a year at Lewiston High School.