Are these sentences worded in the proper way?

The Xorlarrin force had been sent east from Gauntlgrym to find the tunnels that would lead to the region known as the Silver Marches. The party was led by Berellip Xorlarrin, the eldest daughter of Matron Mother Zeerith and a high priestess of Lolth, the Spider Queen, the evil goddess of the dark elves, and her cousin, Tsabrak Xorlarrin, a skilled wizard and a master of Sorcere, the school in Menzoberranzan for young mages.