Complex sentence: Henry II's reign was dominated by war against the House of Hapsburg, chiefly in Italy; he suffered an untimely death in a jousting tournament held to celebrate the Peace of Cateau-Cambrésis at the conclusion of the conflict.
Split into simpler sentences: Henry II's reign was dominated by war against the House of Hapsburg, chiefly in Italy. He suffered an untimely death in a jousting tournament held to celebrate the Peace of Cateau-Cambrésis at the conclusion of the conflict.