Complex sentence: He performed and recorded with Tully and their successors Luke's Walnut, throughout the two years he played in "Hair" and in 1970 joined the Burrows Group once again, this time for Expo 1970 in Osaka, Japan.
Split into simpler sentences: He performed and recorded with Tully and their successors, Luke's Walnut, throughout the two years he played in "Hair". In 1970 he joined the Burrows group once again, this time for Expo 1970 in Osaka, Japan.