Complex sentence: It is a memorial to William Pitt, 1st Earl of Chatham former Prime Minister who was a relative of the Temple family, it was sold in 1848 and is now at Chevening house.
Split into simpler sentences: It is a memorial to William Pitt, 1st Earl of Chatham former Prime Minister who was a relative of the Temple family. The original was sold in 1848 and is now at Chevening house.