Are these sentences worded in the best way?

FYI- The Xorlarrins and Tiago are part of the drow expedition. The Xorlarrins and Tiago decided to release them, and the entire drow expedition except for Brach'thal, who had allied with the primordial and gained control of a lava elemental, retreated to the lower levels of the dwarven complex to avoid the fight that would inevitably resume between the Shadovar and the three companions. This withdrawal interrupted Gol'fanin’s ongoing work on a sword and shield of great magical power for Tiago.