Are these sentences correctly worded?

FYI- The Council of Zulkirs is the mage-lords and Nevron is one of them, Szass Tam is the undead wizard. The night after the riot, and with Szass Tam’s vast army swiftly approaching Bezantur, the zulkirs decided to flee with their remaining followers into exile in the Wizard’s Reach, where they planned to gather strength and await an opportune time to renew the struggle against the undead wizard. The Council’s large fleet soon departed from the city, but not before Nevron killed Kumed Hahpret, the zulkir of the Order of Evocation, because the conjurer had not believed that he was worthy of being a mage-lord.