Complex sentence: Although it continues to be used in DSM-5, the Kraepelinian dichotomy has been challenged by data from modern genetics for over eight years, and there is now evidence of a significant overlap in the genetics of schizophrenia and bipolar disorder.
Split into simpler sentences: Although it continues to be used in DSM-5, the Kraepelinian dichotomy has been challenged by data from modern genetics for over eight years. Furthermore, there is now evidence of a significant overlap in the genetics of schizophrenia and bipolar disorder.