Complex sentence: During a writing jam session, the band began to play "Ta Ta Wayo Wayo", a song from their earliest days together but which had never been recorded in the studio, except as a demo in 1977.
Split into simpler sentences: During a writing jam session, the band began to play "Ta Ta Wayo Wayo", a song from their earliest days together. It had never been recorded in the studio, except as a demo in 1977.