Complex sentence: The family are descendants of Arnold Joost van Keppel, a Dutch nobleman who accompanied William III of England to Britain in 1688 and the King made him the Earl of Albemarle in 1696.
Split into simpler sentences: The family are descendants of Arnold Joost van Keppel, a Dutch nobleman who accompanied William III of England to Britain in 1688. The King made him the Earl of Albemarle in 1696.