Complex sentence: The stories'main characters are aided in their quests by the guardians of the four medallions that are needed to enable the awakening of Uriel's angels in defeating Yaldabaoth (as well as his servant Hilekar) and the dark spirits of Nether.
Split into simpler sentences: The stories'main characters are aided in their quests by the guardians of the four medallions. The four medallions that are needed to enable the awakening of Uriel's angels in defeating Yaldabaoth (as well as his servant Hilekar) and the dark spirits of Nether.