Complex sentence: Walpole was briefly taken in, but later reconsidered, and when Chatterton commited suicide the following year there were rumours that Walpole's treatment of the young man had played a part.
Split into simpler sentences: Walpole was briefly taken in, but later reconsidered. When Chatterton committed suicide the following year, there were rumours that Walpole's treatment of the young man had played a part.