YOU SAID:

he learned a trade from a guy who had being doing for thirty years

INTO JAPANESE

彼は30年間やっていた男から取引を学びました

BACK INTO ENGLISH

He studied trading from a man who had been doing for thirty years

INTO JAPANESE

彼は30年間やっていた男性からの取引を学びました

BACK INTO ENGLISH

He learned a deal from a man who was doing for 30 years

INTO JAPANESE

彼は30年間やっていた男から契約を学びました

BACK INTO ENGLISH

He studied a contract from a man who was doing for 30 years

INTO JAPANESE

彼は30年間やっていた男から契約を勉強しました

BACK INTO ENGLISH

He studied the contract from a man who was doing for thirty years

INTO JAPANESE

彼は30年間やっていた男から契約を学びました

BACK INTO ENGLISH

He studied a contract from a man who was doing for 30 years

INTO JAPANESE

彼は30年間やっていた男から契約を勉強しました

BACK INTO ENGLISH

He studied the contract from a man who was doing for thirty years