Complex sentence: The house and surrounding land was originally owned by the Viscount Bolingbroke who owned the house for several centuries until the cost of caring for the house proved too high, and they were forced to sell.
Split into simpler sentences: The house and surrounding land was originally owned by the Viscount Bolingbroke. The family owned the house for several centuries until the cost of caring for the house proved too high, and they were forced to sell.