Complex sentence: It was part of the expansion of the higher educational system at that time: the University of Alberta had long been established, the University of Calgary was created after legislation had been changed, and an order in council created the University of Lethbridge.
Split into simpler sentences: It was part of the expansion of the higher education system at that time. The University of Alberta had long been established, the University of Calgary was created after legislation had been changed, and an Order in Council created the University of Lethbridge.