Complex sentence: After coming home the next day, Clyde, Hannah and Em hear an animalistic noise in their kitchen and discover food all over the floor, but when the intruder escapes through their dog flap, Clyde assumes it was a raccoon.
Split into simpler sentences: After coming home the next day, Clyde, Hannah and Em hear an animalistic noise in their kitchen and discover food all over the floor. When the intruder escapes through their pet door, Clyde assumes it was a raccoon.