Complex sentence: The succession as head of the house is claimed by Maximiliano de Götzen-Iturbide, an Australian, who descends from Agustin I in the fifth generation, and claims rights to the throne of Mexico in his personal page.
Split into simpler sentences: The succession as head of the house is claimed by an Australian man called Maximiliano de Götzen-Iturbide. Maximiliano descends from Agustin I in the fifth generation, and claims rights to the throne of Mexico in his personal page.