Complex sentence: But she isn't the only ghost haunting the old house and before the film is over both Claire and her husband Robert experience a series of unexplained supernatural events that leave them questioning their sanity as well as their very existence.
Split into simpler sentences: But she isn't the only ghost haunting the old house. Both Claire and her husband Robert experience a series of unexplained supernatural events that leave them questioning their sanity as well as their very existence.