Complex sentence: In this engagement, Colonel Sassaman had defied heavy machine-gun and R.P.G. fire to drag one of his wounded soldiers from his vehicle, after which he then chased down the Iraqi insurgents and killed them.
Split into simpler sentences: In this engagement, Sassaman had defied heavy machine-gun and R.P.G. fire to drag one of his wounded soldiers from his vehicle. Then he chased down the Iraqi insurgents and killed them.