Complex sentence: After the death of the Grand Master Alfonso de Cárdenas in 1493, the Catholic Monarchs incorporated the Order into the Spanish Crown and the pope Adrian VI forever united the office of grandmaster of Santiago to the crown in 1523.
Split into simpler sentences: After the death of the Grand Master Alfonso de Cárdenas in 1493, the Catholic Monarchs incorporated the Order into the Spanish Crown. Pope Adrian VI forever united the office of grandmaster of Santiago to the crown in 1523.