Complex sentence: O’Keefe grew up in St. Louis where he attended McCluer High School and then attended Southern Illinois University Edwardsville where he played on the men's soccer team from 1980 to 1983.
Split into simpler sentences: O’Keefe grew up in St. Louis where he attended McCluer High School. He then attended Southern Illinois University Edwardsville where he played on the men's soccer team from 1980 to 1983.