Complex sentence: Dick Bartley, a popular American radio disc jockey since June 21,1969, hosts several popular syndicated radio shows, including the current American Gold & Rock & Roll's Greatest Hits since 1991.
Split into simpler sentences: Dick Bartley, a popular American radio disc jockey since June 21,1969, hosts several popular syndicated radio shows. Bartley has been producing/hosting the popular oldies radio shows called American Gold & Rock & Roll's Greatest Hits since 1991.