Complex sentence: He asks if schizophrenia is an illness and answers in the negative, since schizophrenia is not understood in classic Virchowian criterion of cellular pathology even in the twenty-first century.
Split into simpler sentences: He asks if schizophrenia is an illness and answers in the negative. Schizophrenia cannot be understood in classic virchowian criterion of cellular pathology even in the twenty-first century.