Simplify the following text for a Grade 16 native English-speaking person.
Original: In clinical psychology or psychiatry , categorical models seek to distinguish and define particular mental disorders or illnesses , whilst continuum or dimensional models propose that some people are more extreme than others on particular dimensions .
Simplified: In psychiatry , categorical models seek to distinguish and define particular mental disorders or illnesses , but continuum or dimensional models propose that some people are more extreme than others on particular dimensions .