YOU SAID:
The creation of the underground railroad cant be traced back to a single person
INTO JAPANESE
地下鉄の創設は一人の人物に遡ることはできません
BACK INTO ENGLISH
The creation of the subway cannot be traced back to a single person
INTO JAPANESE
地下鉄の創設は一人の人物によるものではない
BACK INTO ENGLISH
The creation of the subway was not the work of one person
INTO JAPANESE
地下鉄の建設は一人の人間の仕事ではありませんでした
BACK INTO ENGLISH
Building the subway wasn't one man's job
INTO JAPANESE
地下鉄の建設は一人の人間の仕事ではなかった
BACK INTO ENGLISH
Building the subway was not the work of one man
INTO JAPANESE
地下鉄の建設は一人の男の仕事ではなかった
BACK INTO ENGLISH
Building the subway wasn't one man's job
INTO JAPANESE
地下鉄の建設は一人の人間の仕事ではなかった
BACK INTO ENGLISH
Building the subway was not the work of one man
INTO JAPANESE
地下鉄の建設は一人の男の仕事ではなかった
it is unlikely that this phrase will ever reach equilibrium