Complex sentence: This ordering format contradicts the famous "posted rules," which instruct that the onion preference should be made first, but typical orders are: "Whiz wit," "American wit-out," and not the other way around.
Split into simpler sentences: This ordering format contradicts the posted rules, which instruct that the onion preference should be made first. But typical orders are: "Whiz wit," "American wit-out," and not the other way around.