which is precisely what you wrote, but is utterly trivial such that all you can do with it is:
OR did you mean
which you should have rendered as y/(y + sqrt(y)) so that the contents of the denominator would be clear?
And, by the way, just exactly what was it you wanted to do with this cute and clever little expression? You actually have to tell us what you want. This is Algebra.com. It is NOT the Psychic Hot Line.