Complex sentence: Siskovits infantry was fighting successfully with Prussian soldiers despite being outnumbered 3 to 1, and when Laudon's troops appeared from the other side the result of the battle was determined.
Split into simpler sentences: Siskovits infantry was fighting successfully with Prussian soldiers despite the fact that they were outnumbered 3 to 1. And when Laudon's troops appeared from the other side the result of the battle was determined.