Complex sentence: Despite a pessimistic diagnosis, Van Gogh recovered and returned to the Yellow House by the beginning of January 1889, but spent the following month between hospital and home, suffering from hallucinations and delusions of poisoning.
Split into simpler sentences: Despite a pessimistic diagnosis, Van Gogh recovered and returned to the Yellow House by the beginning of January 1889. He spent the following month between hospital and home, suffering from hallucinations and delusions of poisoning.