Complex sentence: The Hasmonean Civil War was a civil war between two claimants to the Hasmonean Jewish Crown, what began as an inner Jewish conflict became a highly decisive conflict that included the Nabataean Kingdom and ended with a Roman involvement.
Split into simpler sentences: The Hasmonean Civil War was a civil war between two claimants to the Hasmonean Jewish Crown. What began as an inner Jewish conflict became a highly decisive conflict that included the Nabataean Kingdom and ended with a Roman involvement.