Question: Combining and simplifying piecewise: What is the purpose of simplify in this expression

Under piecewise in ?updates,Maple2024,AdvancedMath I find

{simplify,combine}(piecewise(x <= 0, 2*ln(1 - x), 0 < x, ln((x - 1)^2))) assuming (x, real);
                         /  /       2\\ 
                        { ln\(x - 1) / }
                         \            / 

Same result without simplify

{combine}(piecewise(x <= 0, 2*ln(1 - x), 0 < x, ln((x - 1)^2))) assuming (x, real);
                         /  /       2\\ 
                        { ln\(x - 1) / }
                         \            / 

What I do not understand is the grouping of simplify and combine in a set. This looks like a function composition which is normally done with the composition operator

(simplify@combine)(expr)

Asking differently: What is

{simplify,combine}(expr)

supposed to do in the examples?

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