독해 문장 구조 질문드려요

“For a punishment to achieve its objective, it is only necessary that the harm that it inflicts outweighs the benefit that derives from the crime, and into this calculation ought to be factored the certainty of punishment and the loss of the good that the commission of the crime will produce.”
문장 구조가 잘 보이지 않아요. 설명 부탁드려요.