Complex sentence: The Legitimist pretender to the French throne is Louis Alphonse, Duke of Anjou as the senior member of the House of Bourbon who considers Philip V of Spain's renounciation of his claim to the throne of France for himself and his descendants as null and void.
Split into simpler sentences: The Legitimist pretender to the French throne is Louis Alphonse, Duke of Anjou, the senior member of the House of Bourbon. He is recognised by those French monarchists who consider Philip V of Spain's renunciation of his rights of succession to the throne of France as null and void.