Complex sentence: Louis XV was the third son Burgundy his wife Marie Adélaïde of Savoy the eldest daughter of Victor Amadeus II, Duke of Savoy, and Anne Marie d'Orléans.
Split into simpler sentences: Louis XV was the third son Burgundy his wife Marie Adélaïde of Savoy. Louis's mother, Marie Adélaïde of Savoy, was the eldest daughter of Victor Amadeus II, Duke of Savoy, and Anne Marie d'Orléans.