Complex sentence: His colonial ancestor was a Roundhead in the New Model Army, who left Hawkhurst, Kent for New England upon the English Restoration and a Whig relative who fought and was mortally wounded in the Battle of Lexington and Concord against Hugh Percy, 2nd Duke of Northumberland.
Split into simpler sentences: His colonial ancestor was a Roundhead in the New Model Army, who left Hawkhurst in Kent for New England upon the English Restoration. He had a Whig relative who fought and was mortally wounded in the Battle of Lexington and Concord against Hugh Percy, 2nd Duke of Northumberland.