Adding to this, in a real situation those variables are probably not going to be nice single letter variables. With longer names the Lisp syntax with unambiguous structure/order of precedence becomes much nicer.

  (if (or (and foobar
               (some-predicate-p quux)
               (= qwerty 432))
          (a-long-function-call-with-two-args bar ytr))
      ...)

Compared to something like:

  if (foobar &&
      somePredicate(quux) &&
      (qwerty == 432) ||
      aLongFunctionCallWithTwoArgs(bar, ytr)) {
      ...
  }