Complex sentence: Geoff Mann (born Edmund Geoffrey Mann) was a progressive rock musician during the 1980s... and vocalist of the band Twelfth Night from 1981 to November 1983, and later went on to form The Bond, and Eh !
Split into simpler sentences: Geoff Mann (born Edmund Geoffrey Mann) was a progressive rock musician during the 1980s. As lead singer with Twelfth Night from 1981 to November 1983, Mann... and later went on to form The Bond, and Eh!