Complex sentence: In 2011 they released "Fly from Here" featuring Downes, who returned on keyboards after 30 years, and the following year David left the band due to illness and was replaced by Jon Davison from band Glass Hammer.
Split into simpler sentences: In 2011 they released "Fly from Here" featuring Downes, who returned on keyboards after 30 years. The following year David left the band due to illness and was replaced by Jon Davison, also of Glass Hammer.