Complex sentence: John II of Bourbon (1426--1 April 1488, Château de Moulins), son of Charles I of Bourbon and Agnes of Burgundy; was Duke of Bourbon and Auvergne from 1456 to his death.
Split into simpler sentences: John II of Bourbon (1426--1 April 1488, Château de Moulins), was a son of Charles I of Bourbon and Agnes of Burgundy. He was Duke of Bourbon and Auvergne from 1456 to his death.