Complex sentence: The castle was damaged in the English Civil War and then restored in the 18th and 19th centu the 11th century onward, the castle has served as a hereditary stately home and has been in the family of the Duke of Norfolk for over 400 years.
Split into simpler sentences: The castle was damaged in the English Civil War and then restored in the 18th and 19th centuries. From the 11th century onward, the castle has served as a hereditary stately home and has been in the family of the Duke of Norfolk for over 400 years.