Complex sentence: Cernunnos, the Wild Hunt and Dr Dee engage Shakespeare, the Gabriel Hounds, Palamedes, the twins and Flamel in a vicious battle, while making their escape, Josh loses Clarent, and Dee grabs the sword, reuniting it with its twin, Excalibur.
Split into simpler sentences: Cernunnos, the Wild Hunt, and Dr Dee engage Shakespeare, the Gabriel Hounds, Palamedes, the twins, and Flamel in a vicious battle. While making their escape, Josh loses Clarent, and Dee grabs the sword, reuniting it with its twin, Excalibur.