Complex sentence: He was the son of Valdemar II by his wife, princess Berengaria of Portugal and succeeded to the throne on November 1,1250, after the death of his brother Eric IV of Denmark.
Split into simpler sentences: He was the son of Valdemar II by his wife, Princess Berengaria of Portugal. Abel succeeded to the throne on November 1,1250, after the death of his brother Eric IV of Denmark.