Translation:Tú llegaste aquí hace muchos años.
My response was marked incorrect and the suggested correct answer seems very incorrect: "Yo llegué aquí muchos años atrás." I don't think the subject is right to begin with. Reported 3/30.
Some things don't translate literally. This is a construct that you just have to memorize. In this case, think of "hace + x + años" as the equivalent of " x years ago".