Complex sentence: The symbols of the state were a red flag with Polish White Eagle and Lithuanian Vytis and a coat of arms being a mixture of Polish, Lithuanian and Vilnian symbols, similar to the Coat of Arms of the Polish-Lithuanian Commonwealth.
Split into simpler sentences: The symbols of the state were a red flag with Polish White Eagle and Lithuanian Vytis. Its coat of arms was a mixture of Polish, Lithuanian and Vilnian symbols and resembled the Coat of Arms of the Polish-Lithuanian Commonwealth.