Complex sentence: Clary and the rest of the group manages to gain the assistance of the Seelie Queen, but at the cost of two Faerie rings that would allow the wearers to communicate telepathically.
Split into simpler sentences: Clary and the rest of the group solicit the Seelie Queen for help. The Queen agrees to help, but demands the return of two Faerie rings which allow the wearers to communicate telepathically.