Complex sentence: Guy III of Châtillon, Count of Saint Pol (about 1254--April 6,1317), French nobleman, was the son of Guy II of Châtillon and Matilda of Brabant.
Split into simpler sentences: Guy III of Châtillon, Count of Saint Pol (-- April 6,1317) was a French nobleman. He was the son of Guy II of Châtillon and Matilda of Brabant.