Are these three sentences properly worded?

Meanwhile, the blood fiend Tsagoth was summoned from the Abyss and ordered to infiltrate the palace fortress of Aznar Thrul, the zulkir of Evocation and the tharchion of Priador, to find Mari Agneh, the former governor of Priador. Years earlier, Mari had been deposed by Aznar, and she then had appealed to Szass Tam and his allies among the mage-lords to help her keep her position, but they had declined to assist her. When Aznar had learned about Mari’s petition, he took her as a prisoner and abused her as his personal sex slave.