Complex sentence: The Military of Uruguay uses the Artigas's Cockade, which is blue-white-blue with a red diagonal stripe; whereas the police uses a red-white-blue cockade based on the Flag of the Treinta y Tres.
Split into simpler sentences: The Military of Uruguay uses the Artigas's Cockade, which is blue-white-blue with a red diagonal stripe. Meanwhile the police uses a red-white-blue cockade based on the Flag of the Treinta y Tres.