Complex sentence: After World War II, he became club pro at the Los Angeles Tennis Club from 1947 to 1972 and an instructor at the Marlborough School from 1947 to 1970, adding the coaching position at USC in 1954.
Split into simpler sentences: After World War II, he became club pro at the Los Angeles Tennis Club (LATC) from 1947 to 1972. He was also an instructor at the Marlborough School from 1947 to 1970, and added the coaching position at USC in 1954.