Complex sentence: During their courtship, Mercy continues to tease and abuse him verbally, enjoying her power over him, to which he responds affably, muttering that he will get his revenge once they are married.
Split into simpler sentences: During their courtship, Merry continues to tease and abuse him verbally, enjoying her power over him. He in turn responds to this teasing affably, muttering that he will get his revenge once they are married.