Unfortunately there is not much you can do against this effect.
You may use "simplify,max" instead of just "simplify", hoping that this extra portion of simplify will make the expression small enough so it can be displayed. "simplify,max" can take quite some time and its unsure if it will come up with a smaller result.
You can assign the result to a function which is dependent on he various variables not used in the solve and use that function for further calculations, though.
Obviously the programmers thought that the display of an expression larger than a specific built-in limit will be of no use and only clutters the page. You would have to use an older version of Mathcad like Mathcad 11 to see the result. MC11 will happily spread a symbolic result several pages wide without problem (and its really doubtful if that is of any help).
