Complex sentence: In 2006, following Newfield's departure for a solo career, Aubrey Collins was selected as the group's new lead singer; a year later, Collins left as well; finally, Ira Dean subsequently left in February 2008.
Split into simpler sentences: In 2006, following Newfield's departure for a solo career, Aubrey Collins was selected as the group's new lead singer. A year later, Collins left as well, and Ira Dean subsequently left in February 2008.