Complex sentence: Maggie appears in the penultimate episode of season four, "Primeval", as a walking corpse, employed by Adam to finish off Project 314, the creation of more like him, manufactured from the parts of demons and humans combined.
Split into simpler sentences: Maggie appears in the penultimate episode of season four, "Primeval", as a walking corpse, employed by Adam to finish off Project 314. This project involves the creation of more like him, manufactured from the parts of demons and humans combined.