Complex sentence: Nagel graduated in 1945 and enrolled at the University of California, Los Angeles (UCLA), where he was a three time letter-winner from 1946 to 1949 as a quarterback and halfback for the Bruins.
Split into simpler sentences: Nagel graduated in 1945 and enrolled at the University of California, Los Angeles (UCLA). He was a three time letter-winner there from 1946 to 1949 as a quarterback and halfback for the Bruins.