YOU SAID:

mark is not real because he was never real to begin with

INTO JAPANESE

彼はそもそも本物ではなかったので、マークは本物ではありません

BACK INTO ENGLISH

Mark isn't real because he wasn't real in the first place

INTO JAPANESE

マークはそもそも本物ではなかったので本物ではありません

BACK INTO ENGLISH

Mark wasn't real in the first place, so it's not real

INTO JAPANESE

マークはそもそも本物ではなかったので、本物ではありません

BACK INTO ENGLISH

Mark wasn't real in the first place, so it's not real