Original sentence: The Grand Duke's marriage to Princess Leonida is controversial; many consider it to be morganatic (though princess descended from a dynasty that had ruled as kings in Armenia and Georgia since the early Middle Ages, it had been reduced to the status of Russian nobility for over a century prior to the Russian Revolution)
Edited sentence: The Grand Duke's marriage to Princess Leonida is controversial; many consider it to be morganatic (though the princess descended from a dynasty that had ruled as kings in Armenia and Georgia since the early Middle Ages, it had been reduced to the status of Russian nobility for over a century prior to the Russian Revolution)