YOU SAID:

will apply the criterion that his acts should meet if they are in fact to most contribute to his happiness.

INTO JAPANESE

彼らが実際に彼の幸福に最も貢献するのであれば、彼の行為が満たすべき基準を適用します。

BACK INTO ENGLISH

If they really contribute the most to his well-being, apply the criteria that his actions must meet.

INTO JAPANESE

彼らが本当に彼の幸福に最も貢献しているのなら、彼の行動が満たさなければならない基準を適用してください。

BACK INTO ENGLISH

If they really contribute the most to his well-being, apply the criteria that his actions must meet.