Complex sentence: Cumanus' time in office was marked by disputes between his troops and the Jewish population, and his failure to respond to an anti-Jewish murder in Samaritan territory led to violent conflict between Jews and Samaritans.
Split into simpler sentences: Cumanus' time in office was marked by disputes between his troops and the Jewish population. Ventidius Cumanus failed to respond to an anti-Jewish murder in Samaritan territory which led to the violent conflict between Jews and Samaritans.