Complex sentence: Crowley finds his consultants and upon knowing that they follow Lucifer as he will reward them and the Hell will not follow him while he's out there, he kills them both.
Split into simpler sentences: Crowley finds his consultants and learns that they follow Lucifer as he will reward them. They tell Crowley that Hell will not follow him while Lucifer is out there; as a result, Crowley kills them both.