Complex sentence: Leoric, a stiff and upright man of rigid morals, refuses to discuss Meriet's choice; if his son is determined to become a monk, Leoric will not have him back.
Split into simpler sentences: Leoric, a stiff and upright man of rigid morals, refuses to discuss Meriet's choice. He insists that if his son is determined to become a monk, Leoric will not have him back.