Complex sentence: Medical scans reveal the party to be in good health, all except for Dr. Sevrin, who is shown to be a carrier of the Synthecoccus Novae virus, which has been accidentally created by technological society.
Split into simpler sentences: Medical scans reveal the party to be in good health, except for Dr. Sevrin. He's a carrier of the Synthecoccus Novae virus, which has been accidentally created by technological society.