Complex sentence: Great Southern Railway (GSR) is a private company operating long-distance passenger trains on ARTC's standard gauge lines, and run from the Keswick Rail Terminal, not from the main city station-Keswick is an industrial suburb just west of the CBD.
Split into simpler sentences: Great Southern Railway (GSR) is a private company operating long-distance passenger trains. These trains use ARTC's standard gauge lines and run from the Keswick Rail Terminal, not from the main city station-Keswick is an industrial suburb just west of the CBD.