Complex sentence: He attended the University of Colorado and the U.S. Coast Guard Academy having enlisted in the Marine Corps in 1935 and was later commissioned a second lieutenant in 1938 following graduation from the University of Colorado.
Split into simpler sentences: He attended the University of Colorado and the U.S. Coast Guard Academy. He enlisted in the Marine Corps in 1935 and was commissioned a second lieutenant in 1938 following graduation from the University of Colorado.