Complex sentence: Geoffrey VI (Goeffroy VI) (died 6 February 1250), Viscount of Châteaudun, son of Geoffrey V, Viscount of Châteaudun, and Adelicia de Nevers.
Split into simpler sentences: Geoffrey VI (Goeffroy VI) (died 6 February 1250) was a Viscount of Châteaudun. He was the son of Geoffrey V, Viscount of Châteaudun, and Adelicia de Nevers.