Complex sentence: Hart began his association with British rock band, Supertramp, in 1986 initially as a studio and touring musician; he provided guitar, keyboards, lead and backing vocals for their album, "Free as a Bird", which was issued in October 1987.
Split into simpler sentences: Hart began his association with British rock band Supertramp in 1986, initially as a studio and touring musician. He provided guitar, keyboards, lead and backing vocals for their album, "Free as a Bird", which was issued in October 1987.