Complex sentence: Sundray left in 1996 and was replaced by Freddi Poole, who left in 2009, with Joyce Vincent Wilson (formerly of Tony Orlando and Dawn) stepping in as the newest member.
Split into simpler sentences: Sundray left in 1996 and was replaced by Freddi Poole. Freddi left in 2009, with Joyce Vincent Wilson (formerly of Tony Orlando and Dawn) stepping in as the newest member.