Complex sentence: Aside from the multi-level templates--which range from a polite pointer to the sandbox, to a stern warning that they desist immediately or face consequences--there are also single issue notices that serve to remind other editors about minor mistakes.
Split into simpler sentences: Aside from the multi-level templates, which range from a polite pointer to the sandbox, to a stern warning that they desist immediately or face consequences. There are also single issue notices that serve to remind other editors about minor mistakes.