Complex sentence: Adalbert I of Vermandois (French: Albert I le Pieux, "the Pious") (ca.915/917--9 September 988), Count of Vermandois, was the son of Herbert II of Vermandois and Hildebrante of France.
Split into simpler sentences: Adalbert I of Vermandois (French: Albert I le Pieux) (ca.915/917--9 September 988), Count of Vermandois. He was son of Herbert II of Vermandois and Hildebrante of France.