Complex sentence: A love triangle is built between Daoud, Sophia, and Simon de Gobingnon, a French knight assigned to protect the Mongol ambassadors, Daoud's chief nemesis and the son of the major characters in Shea's "All Things are Lights".
Split into simpler sentences: A love triangle is built between Daoud, Sophia, and Simon de Gobingnon, a French knight assigned to protect the Mongol ambassadors. He is Daoud's chief nemesis and the son of the major characters in Shea's "All Things are Lights".