You may use symbolic evaluation to get an expanded view of the expression but I guess you wont get the summands in the order you show. Unfortunately, Prime does not offer many options to control the way the Symbolics displays its results.
Because you use the decimal point in your expression, the symbolics switch to some kind of float mode and ALL numbers are displayed with at least one decimal, which is quite silly and looks ugly.
The last result with the modifier "factor" is strange. The factor 1.0 actually should not be shown. It even may be called a bug that Prime does this.
For future questions please keep in mind to always attach you worksheet as well.
I agree that there is no reason for redefining the function based on the symbolic simplification.
I could be done that way
and indeed evaluation should be a little bit faster as the calculation 11+47 has not to be done every time you evaluate the function. But I doubt that this decrease of calc time would be noticeable - not even when done million times.
A redefinition would make sense if the original function definition is extremely time consuming and could be simplified symbolically - e.g. when using integrals as numerical integration is rather time consuming.
Here an example with a double integration. The non-simplified function definition takes more than 100 times longer:
Doing the same with the function given here does not show a significant improvement as expected
