Complex sentence: When Belluccia's father, the galley captain Federico, arrives, he threatens Carlo with death, but Belluccia takes pity on him and the couple are reconciled and married, and they sail back to their old hometown (hence the title).
Split into simpler sentences: When Belluccia's father, the galley captain Federico, arrives, he threatens Carlo with death, but Belluccia takes pity on him and the couple are reconciled and married. At the end of the opera we see the newlyweds sail back to their old hometown on Federico's galley (hence the title).