Complex sentence: The Georgian West Wing dates from the late 18th century but in 1812 the estates and the Barony passed to Henry Willoughby of the Birdsall, Yorkshire branch of the family and Middleton declined in importance in family terms.
Split into simpler sentences: The Georgian West Wing dates from the late 18th century. In 1812 the estates and the Barony passed to Henry Willoughby of the Birdsall, Yorkshire branch of the family and Middleton declined in importance in family terms.