Complex sentence: He contacts the Company, letting them know he wants a different identity and they agree, but Hamilton learns as he is wheeled into the operating room, before being sedated, that he is to be killed.
Split into simpler sentences: He contacts the Company, letting them know he wants a different identity and they seem to agree. It turns out to be a lie and Hamilton learns as he is wheeled to the operating room, before being sedated, that he is to be killed.