Complex sentence: As he walks through the wood with the Gruffalo, the mouse meets all of the other animals again and they recoil in horror at the pair with the Gruffalo becoming increasingly impressed at how terrifying the mouse seems to be.
Split into simpler sentences: As he walks through the wood with the Gruffalo, the mouse meets all of the other animals again and they recoil in horror at the pair. The Gruffalo becomes increasingly impressed at how terrifying the mouse seems to be.