Complex sentence: The band which would eventtually become Cardiacs began life in 1977 and originally featured Tim Smith on guitar and backing vocals, Michael Pugh on lead vocals and Peter Tagg on drums.
Split into simpler sentences: The band which would eventually become Cardiacs began life in 1977. The initial lineup was Michael Pugh on lead vocals, Tim Smith on guitar and backing vocals, and Peter Tagg on drums.