Complex sentence: When a scout group of the Cazadores a Caballo Cavalry Regiment encounters the marching Allied forces, Sotomayor decides to fortify the position on the surrounding hills, where the Allies larger numbers represent no advantage whatsoever.
Split into simpler sentences: When a scout group of the Cazadores a Caballo Cav. Now he orders to fortify the position on the surrounding hills, where the Allies larger numbers represent no advantage whatsoever.