Complex sentence: The band was formed in September 1968 by drummer Jon Hiseman with tenor sax player Dick Heckstall-Smith, who had previously worked together in John Mayall's Bluesbreakers on the "Bare Wires" album.
Split into simpler sentences: The band was formed in September 1968 by drummer Jon Hiseman with tenor sax player Dick Heckstall-Smith. They had also worked together in John Mayall's Bluesbreakers (1967/8) and recorded on the "Bare Wires" album.