Complex sentence: Adachi outwardly agrees, but decides to sabotage him in order to honor his promise to the Investigation Team to follow society's rules, and subtly manipulates the Investigation Team towards defeating Sho.
Split into simpler sentences: Adachi outwardly agrees, but decides to sabotage him in order to honor his promise to the Investigation Team to follow society's rules. Adachi subtly manipulates the Investigation Team towards defeating Sho.