Complex sentence: Although the'heartland' of rugby league is the north east coast, the AMNRL is quickly expanding to other areas of the eastern coast, as well as this, efforts are being made to set up a west coast competition.
Split into simpler sentences: Although the'heartland' of rugby league is the north east coast, tthough some expansion is underway in other areas of the eastern coast. Efforts are being made to set up a west coast competition.