Complex sentence: His only daughter, Anne, married her cousin Sir Thomas Littleton, 2nd Baronet and their son Sir Thomas Littleton (c.1647-1710), was Speaker of the House of Commons from 1698 to 1700, and Treasurer of the Navy from 1700 to 1710.
Split into simpler sentences: His only daughter, Anne, married her cousin, Sir Thomas Littleton, 2nd Baronet. Their son, Sir Thomas Littleton (c.1647-1710), was Speaker of the House of Commons from 1698 to 1700, and Treasurer of the Navy from 1700 to 1710.