Complex sentence: Ragnvald was the father of Hrolf Ganger, the founder of Normandy, and Turf-Einar, ancestor of the jarls of Orkney.
Split into simpler sentences: Ragnvald was the father of Hrolf Ganger, the founder of Normandy. He was also the father of Turf-Einar, the ancestor of the jarls of Orkney.