Complex sentence: But the will requires Betty to take up residence in the old house, where Morlant's walking corpse soon appears and speaks to her, telling her that he is an immortal adept and demanding the return of his secret diary.
Split into simpler sentences: But the will requires Betty to take up residence in the old house, where Morlant's corpse soon appears, walking and talking. Morlant tells her that he is an immortal adept and demands the return of his secret diary.