Complex sentence: His last comeback saw Pepper, which had started his career in Stan Kenton's big band, becoming a member of Buddy Rich's Big Band from 1968 to 1969, and in 1977 and 1978 made two well received tours of Japan.
Split into simpler sentences: His last comeback saw Pepper, which had started his career in Stan Kenton's big band, becoming a member of Buddy Rich's Big Band from 1968 to 1969. In 1977 and 1978 made two well received tours of Japan.