Complex sentence: Most towns and some villages have their own city guards, which supervise public order and road safety; however city guards have jurisdiction only over misdemeanors and in cases of crimes may serve only in a supportive role for the state police.
Split into simpler sentences: Most towns and some villages have their own city guards, which supervise public order and road safety. However, city guards have jurisdiction only over misdemeanors and in cases of crimes may serve only in a supportive role for the state police.