Complex sentence: It was a popular tune with Morrison in the 70s and he performed it regularly in concert as well as including it in the 1974 broadcast of the July 1973 performance at the Rainbow Theatre, London that featured The Caledonia Soul Orchestra.
Split into simpler sentences: It was a popular tune with Morrison in the 70s, that he performed regularly in concert. The song was included in the 1974 broadcast of Morrison's July 1973 performance at the Rainbow Theatre, London that featured The Caledonia Soul Orchestra.