YOU SAID:

He races well but qualifies not so well, which means that he's more likely to be let go than his team-mate.

INTO JAPANESE

彼は良いレースをするが、それほど良い資格を持っていない、つまり彼はチームメイトよりも手放される可能性が高いことを意味する。

BACK INTO ENGLISH

He has a good race, but doesn't have much qualification, which means he's more likely to be let go than his teammates.

INTO JAPANESE

彼は良いレースをしているが、あまり資格を持っていないので、チームメイトよりも手放される可能性が高い。

BACK INTO ENGLISH

He's doing a good race, but he's not very qualified, so he's more likely to be let go than his teammates.

INTO JAPANESE

彼は良いレースをしているが、彼はあまり資格がないので、チームメイトよりも手放される可能性が高い。

BACK INTO ENGLISH

He's doing a good race, but he's not very qualified, so he's more likely to be let go than his teammates.