Complex sentence: The original narrow gauge railway railway served, indeed often created, the towns at the stations along the way however the new standard gauge railway has stations at Tennant Creek and Katherine, plus passing loops at Illoquara and Newcastle Waters.
Split into simpler sentences: The original narrow gauge railway served, indeed often created, the towns at the stations along the way. The new standard-gauge railway has stations at Tennant Creek and Katherine, plus passing loops at Illoquara and Newcastle Waters.