Complex sentence: Failing to make any headway, Lionheart split up in 1986, with Bierne going into management, Murrell fronting Irish rockers, Mama's Boys, and Newton and Mann joining the McAuley Schenker Group.
Split into simpler sentences: Failing to make any headway, Lionheart split up in 1986. Bierne went into management, Murrell fronted Irish rock group, Mama's Boys, and Newton and Mann joined the McAuley Schenker Group.