Are these sentences correctly worded?

FYI- Szass Tam is the lich. A few days after the Council of Zulkir’s ships left Bezantur, Szass Tam and his host arrived in the city, where they were welcomed by cheering crowds. Although essentially all of Thay was now under his control and the war was won, the lich was still determined to pursue and annihilate the zulkirs and the remnants of their legions. Szass Tam, his necromancers, and the other Red Wizards serving him performed powerful magical rituals that summoned a sizeable force of drowned men and undead aquatic beasts, as well as created a fleet of warships consisting of darkness that could carry a large portion of the northern army.