Complex sentence: Stan tells Butters to come along to learn about the device, but he refuses, saying that the device is nothing but trouble and his job is done, and goes home to tell his parents that he's not dead.
Split into simpler sentences: Stan tells Butters to come along to learn about the device, but he refuses, saying that the device is nothing but trouble and his job is done. He goes home to tell his parents that he's not dead.