Complex sentence: William Cavendish, 3rd Duke of Devonshire, (26 September 1698--5 December 1755) was a British nobleman and Whig politician, the son of William Cavendish, 2nd Duke of Devonshire and the Hon. Rachel Russell.
Split into simpler sentences: William Cavendish, 3rd Duke of Devonshire, (26 September 1698--5 December 1755) was a British nobleman and Whig politician. He was the son of William Cavendish, 2nd Duke of Devonshire and the Hon. Rachel Russell.