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