Final answer:
The subtitle 'From Simple to Complex' is inappropriate for a book on the history of psychopathology, as it does not reflect the evolution from supernatural to scientific explanations of mental illness.
Step-by-step explanation:
The subtitle 'From Simple to Complex' is NOT appropriate for a book titled The History of Psychopathology based on the discussion of changing views of mental illness. Over time, the understanding of mental illness has evolved from supernatural and religious explanations to more scientific and complex biochemical understandings.
This evolution is better encapsulated in subtitles that reflect the change from spiritual interpretations to medical treatments, such as 'From Dopamine to Demons', 'From Exorcism to Rx', and 'From Magic to Molecules', which emphasize the shift from non-scientific to scientific frameworks in understanding and treating mental illness.