Complex sentence: Alexander Montgomerie (c.1660-February 18 1729), 9th Earl of Eglinton married Lady Ann Gordon, daughter of George Gordon, 1st Earl of Aberdeen and Anne Lockhart of Tarbrax, Countess of Aberdeen.
Split into simpler sentences: Alexander Montgomerie (c.1660-February 18 1729) was the ninth Earl of Eglinton. He married Lady Ann Gordon, daughter of George Gordon, 1st Earl of Aberdeen and Anne Lockhart of Tarbrax, Countess of Aberdeen.