original: The majority of his anger is generated in endless battles with Vyvyan, which he invariably loses.
simplifications: The majority of his anger is created in the endless battles with Vyvyan that he loses. Much of his anger comes from endless losing battles with Vyvyan. Most of his anger comes from battles with Vyvyan, which he always loses. Most of his anger comes from his endless battles with Vyvyan. He loses them. Most of his anger comes from endless battles with Vyvyan, which he always loses. Most of his anger comes from endless battles with Vyvyan. He always loses. Most of his anger comes from losing endless battles to Vyvyan. Most of his anger is caused by endless fights with Vyvyan, which he always loses. Most of his anger is created in endless battles with Vyvyan. He always loses. Most of his anger is from always losing to Vyvyan in battle.