Because the operators all take a list of values it's sometimes convenient to format them like any other long list, with each nested sub-expression on its own line to form a tree:

    (setv result (- (/ (+ 1 3 88)
                       2)
                    (* 8 
                       (+ 3 2)))

Another possibility is to use a (let ...) to give nested values temporary names, like:

    (setv result (let ((first (/ (+ 1 3 88) 2))
                       (second (* 8 (+ 3 2))))
                   (- first second)))

It helps if "first" and "second" have meaningful names like "velocity" or "force" that can describe what they are.