Complex sentence: He won the S.F. city junior title in 1963 at age 16, and the following year won the 1964 U.S. Junior Amateur, and enrolled at Brigham Young University in 1965.
Split into simpler sentences: He won the San Francisco city junior title in 1963 at age 16, and the following year won the 1964 U.S. Junior Amateur. He enrolled at Brigham Young University in 1965.