YOU SAID:
In the case of a joint work prepared by two or more authors who did not work for hire, the copyright endures for a term consisting of the life of the last surviving author and 70 years after such last surviving author’s death.
INTO JAPANESE
二人以上の著作者が共同して作成した著作物であつてその雇用に従事しなかったものについては、著作権の存続期間は、最後に存続した著作者の生涯及び最後に存続した著作者が死亡した後七十年とする。
BACK INTO ENGLISH
In the case of a work jointly created by two or more authors who did not engage in employment, the duration of the copyright shall be seventy years after the death of the last surviving author and the last surviving author.
INTO JAPANESE
二人以上の著作者でその雇用に従事しなかったものが共同して作成した著作物にあつては、著作権の存続期間は、最後に存続した著作者及び最後に存続した著作者の死亡後七十年とする。
BACK INTO ENGLISH
In the case of a work jointly created by two or more authors who did not engage in employment, the duration of the copyright shall be seventy years after the death of the last surviving author and the last surviving author.
Well done, yes, well done!