I don't think zeeman and stark effects are even named in the current syllabus, so you don't even need to mention them, just say that bohr/rutherford model doesn't explain how spectral lines split in strong external electric and magnetic fields, if you choose to mention it as a limitation. There are a few simpler limitations, like the fact that both include accelerating electrons that don't emit EM waves and that they don't account for interactions between electrons, thus can only be accurate for hydrogen

