Complex sentence: A couple of miles from the Waterloo terminus, the line runs alongside the Brighton Main Line, both lines pass through Clapham Junction-the busiest station in Europe (and one of the busiest in the world) by railway traffic.
Split into simpler sentences: A couple of miles from the Waterloo terminus, the line runs alongside the Brighton Main Line, both lines pass through Clapham Junction. Consequently, Clapham Junction is the busiest station in Europe (and one of the busiest in the world) by railway traffic.