Complex sentence: MRI studies have found a smaller brain volume and larger ventricles in people with schizophrenia--however researchers do not know if the shrinkage is from the schizophrenia or from the medication.
Split into simpler sentences: MRI studies have found a smaller brain volume and larger ventricles in people with schizophrenia. Researchers do not know if the shrinkage is from the schizophrenia or from the medication.