One of the things that frustrates me most about Mathematica's symbolic manipulations is the fact that output is often presented quite differently than most humans would write it. This is especially egregious when square roots are involved. For example, Mathematica will output this
when I think most humans (or at least physicists) would consider this to be "simpler":
My question is: Is there any simplification function, option, or other trick for coercing Mathematica into formatting an output thusly? I have so far not had any success finding one, and I've explored various simplification formulas as well as trying to apply assumptions about the variables (real, positive, etc.) -- though maybe I just haven't stumbled on the right one.