Complex sentence: The battle at New Ross was a heavy defeat for the rebels who lost almost 3,000 men and survivors who had fled the fighting had reached Scullabogue with news of the terrible losses while the battle still raged.
Split into simpler sentences: The battle at New Ross was a heavy defeat for the rebels who lost almost 3,000 men. Survivors who had fled the fighting had reached Scullabogue with news of the terrible losses while the battle still raged.