Complex sentence: The train reached a set of points at a speed over (where it should have been traveling at) derailed lomotive left the track and plowed toward houses at the side of the track, smashing into one.
Split into simpler sentences: The train reached a set of points at a speed over (where it should have been traveling at), and derailed. The lomotive left the track and plowed toward houses at the side of the track, smashing into one.