Complex sentence: In 1148, Géza sent troops to his brother-in-law, Iziaslav II against prince Vladimir of Chernihiv, while in 1149, he assisted his maternal uncle, duke Uroš II of Raška against the Byzantine Empire.
Split into simpler sentences: In 1148, Géza sent troops to his brother-in-law, Iziaslav II against Prince Vladimir of Chernihiv. In 1149, he assisted his maternal uncle, Duke Uroš II of Raška against the Byzantine Empire.