Complex sentence: There is evidence to suggest that certain mental disorders not only produce olfactory deficits but also predict them and evidence has been found for a number of disorders, including schizophrenia, Parkinson's disease, Huntington's disease, alcoholic Korsakoff's syndrome, and Alzheimer's disease.
Split into simpler sentences: There is evidence to suggest that certain mental disorders not only produce olfactory deficits but also predict them. Evidence has been found for a number of disorders, including schizophrenia, Parkinson's disease, Huntington's disease, alcoholic Korsakoff's syndrome, and Alzheimer's disease.