Complex sentence: Leodegrance had served Uther Pendragon, King Arthur's biological father and regnal predecessor, and was entrusted with the keeping of the Round Table at Uther's death.
Split into simpler sentences: Leodegrance had served Uther Pendragon, King Arthur's biological father and regnal predecessor. Leodegrance was entrusted with the keeping of the Round Table at Uther's death.