Complex sentence: Olfactory memory deficits can be a significant teller of a number of things going on within the brain and there is evidence to suggest that certain mental disorders produce olfactory deficits and olfactory deficits can in turn, be a significant predictor of mental disorders.
Split into simpler sentences: Olfactory memory deficits can be significant indications of a number of things going on within the brain. There is evidence to suggest that certain mental disorders produce olfactory deficits and olfactory deficits can in turn be a significant predictor of mental disorders.