Complex sentence: A doctor specializing in the study of people with super abilities whom he has dubbed "Alphas", he leads a government-sponsored team of such Alphas to help identify and aid other Alphas or stop/contain dangerous ones.
Split into simpler sentences: A doctor specializing in the study of people with superhuman abilities whom he has dubbed "Alphas". He leads a government-sponsored team of such Alphas to help identify, aid, and/or stop/contain dangerous ones.