Complex sentence: Harmon played college football at the University of Michigan from 1938--1940, he majored in English and Speech, hoping for a future career in broadcasting, and won the Heisman Trophy his senior season.
Split into simpler sentences: Harmon played college football at the University of Michigan from 1938 to 1940. There he majored in English and Speech, hoping for a future career in broadcasting, and won the Heisman Trophy his senior season.