Complex sentence: After his retirement, brought on by WWII, he taught water survival for the navy (his vision kept him fom serving directly), and went on to teach at, and to coach the swim team of, the University of Pennsylvania.
Split into simpler sentences: After his retirement, brought on by World War II, he taught water survival for the Navy after his vision kept him from serving directly. He went on to teach at, and to coach the swim team of, the University of Pennsylvania.