Complex sentence: He remained in the team for the remainder of the 1966--67 season as the club won promotion to the First Division, and was part of the squad that won the United Soccer Association league that summer under the Los Angeles Wolves guise.
Split into simpler sentences: He remained in the team for the remainder of the 1966/67 season as the club won promotion to the top flight. He also was part of the club's winning of the United Soccer Association League that summer under the Los Angeles Wolves guise.