Complex sentence: On the other hand, the bulk of Italian ethnogenesis occurred prior to Germanic or non European invasions because geneticists agree that no migrations other than the Greek migrations in Southern Italy and Sicily had any substantial biological impact on Italians.
Split into simpler sentences: On the other hand, the bulk of Italian ethnogenesis occurred prior to Germanic or non European invasions. Geneticists agree that no migrations other than the Greek settlement in Southern Italy and Sicily had any substantial biological impact on Italians.