Complex sentence: Recognizing McCarty's voice, Garrett drew his own revolver and fired twice, the first bullet striking McCarty in the chest just above his heart, although the second one missed and struck the mantel behind him.
Split into simpler sentences: Recognizing McCarty's voice, Garrett drew his own revolver and fired twice. The first bullet struck McCarty in the chest just above his heart, although the second one missed and struck the mantel behind him.