Complex sentence: Achmed, King of Ylorc, is attempting to rebuild the Lightcatcher inside the peak of Gurgus--an ancient device from Gwylliam's Empire, with the help of a member of the Panjeri tribe called Theophila, who are masters of stained glass.
Split into simpler sentences: Achmed, King of Ylorc, is attempting to rebuild the Lightcatcher--an ancient device from Gwylliam's Empire--inside the peak of Gurgus. He enlists the help of Theophila, a member of the Panjeri tribe, who are masters of stained glass.