Simplify the following text for a Grade 9 native English-speaking person.
Original: Louis de France , Dauphin of France ( 1 November 1661 , - 14 April 1711 ) was the eldest son and heir of Louis XIV , King of France and of his spouse , Marie Therese of Austria .
Simplified: Louis de France ( 1 November 1661 â `` 14 April 1711 ) was the eldest son and heir of Louis XIV , King of France and of his spouse , Maria Theresa of Spain .