Complex sentence: Chaco berates them for killing one of their own, but Harold chastises him for allowing the Creutzfeldt-Jakob epidemic to occur and has Chaco executed by the masked figure.
Split into simpler sentences: Chaco berates them for killing one of their own, but Harold chastises him for allowing the Creutzfeldt-Jakob epidemic to occur. He has Chaco executed by the masked figure.