Complex sentence: On 11 Aug 1659 he married Lady Jean Wemyss, daughter of David Wemyss, 2nd Earl of Wemyss, and his first wife Anna Balfour: his only son was John Gordon, 16th Earl of Sutherland.
Split into simpler sentences: On 11 Aug 1659 he married Lady Jean Wemyss, daughter of David Wemyss, 2nd Earl of Wemyss, and his first wife Anna Balfour. His only son was John Gordon, 16th Earl of Sutherland.