Complex sentence: The Pope's awarding of the Order of Christ "motu proprio" brought the Papacy and the Crown of Portugal into conflict on several occasions, as the King of Portugal believed himself to be the legitimate only "fons honorum".
Split into simpler sentences: The Pope's awarding of the Order of Christ "motu proprio" brought the Papacy and the Crown of Portugal into conflict on several occasions. The King of Portugal believing himself to be the legitimate only "fons honorum".