Complex sentence: The NZR EA class (later EO of 1968) were used by New Zealand Railways between 1968 and 1997 on the Otira-Arthurs Pass section of the Midland line of the South Island, through the Otira Tunnel.
Split into simpler sentences: The NZR EA class (later EO of 1968) was a class operated by New Zealand Railways between 1968 and 1997. They were used on the Otira-Arthurs Pass section of the Midland line of the South Island, through the Otira Tunnel.