Original: Many works from this period were performed by the Pierrot Players which Davies founded with Harrison Birtwistle in 1967 (they were reformed as The Fires of London in 1970, disbanded in 1987).
Simplified: Many works from this period were performed by the Pierrot Players which Davies founded with Harrison Birtwistle in 1967 (they were reformed as The Fires of London in 1970 and stayed together until 1987).