Complex sentence: The Balvano train disaster is the deadliest railway accident ever happened in Italy and one of the worst railway disasters ever, occurred on the night between 2nd 3rd March 1944 in southern Italy, near Balvano (Basilicata).
Split into simpler sentences: The Balvano train disaster was the deadliest railway accident in Italian history and one of the worst railway disasters ever. It occurred on the night between 2-3 March 1944 in southern Italy, near Balvano (Basilicata).