Complex sentence: Its replacement was built c.1730 by John Sanderson for Bridget, the Duchess of Rutland, the only surviving child of the second Lord Lexington, who had married John Manners, 3rd Duke of Rutland and whose descendants would be known by the name of Manners-Sutton.
Split into simpler sentences: Its replacement was built c.1730 by John Sanderson for Bridget, the Duchess of Rutland, the only surviving child of the second Lord Lexington. She had married John Manners, 3rd Duke of Rutland and their descendants would be known by the name of Manners-Sutton.