Original sentence: George de Dunbar, 11th Earl of Dunbar & March, Lord of Annandale and the Isle of Man, (c1370 - after 1457) was the last of his family to be the Earl of March
Edited sentence: George de Dunbar, 11th Earl of Dunbar & March, Lord of Annandale and the Isle of Man, (c1370 - after 1457) was the last of his family to hold these illustrious titles