YOU SAID:

he went and climbed a hill then a mountain then went down the mariana trench and his wrench went flat and he rode a shark to the surface.

INTO JAPANESE

彼は丘に登り、それから山に登り、それからマリアナ海溝を下り、レンチが壊れてサメに乗って海面まで上がった。

BACK INTO ENGLISH

He climbed a hill, then a mountain, then down the Mariana Trench, where his wrench broke and he rode a shark to the surface.

INTO JAPANESE

彼は丘を登り、次に山を登り、マリアナ海溝を下り、そこでレンチが壊れ、サメに乗って海面まで上がった。

BACK INTO ENGLISH

He climbed a hill, then a mountain, then down the Mariana Trench, where his wrench broke and he rode a shark to the surface.