Complex sentence: Until 1984 Adelaide station was the terminus for country and interstate passenger trains, but there are no longer any regular country train services in South Australia and all interstate services are standard gauge and call at Keswick Rail Terminal instead.
Split into simpler sentences: Until 1984 Adelaide station was the terminus for country and interstate passenger trains. There are no longer any regular country train services in South Australia, and the interstate services now all operate on standard gauge, and terminate at the Keswick Rail Terminal instead.