Complex sentence: Otto of Vermandois (979--25 May 1045), Count of Vermandois, was the son of Herbert III of Vermandois and Ermengarde of Bar-sur-Seine.
Split into simpler sentences: Otto of Vermandois (979--25 May 1045), Count of Vermandois. He was son of Herbert III of Vermandois and Ermengarde of Bar-sur-Seine.