YOU SAID:

Jesh is small so he is very slow and his brain is smaller the size of a peanut

INTO JAPANESE

ジェシュは体が小さいので動作が非常に遅く、脳はピーナッツほど小さいです。

BACK INTO ENGLISH

Jeshu is very slow due to his small body, and his brain is as small as a peanut.

INTO JAPANESE

ジェシュは体が小さいため非常に動きが遅く、脳もピーナッツほど小さいです。

BACK INTO ENGLISH

Jeshu is very slow due to his small body, and his brain is as small as a peanut.