Complex sentence: Although they occasionally still occur, the tradition has long been overshadowed by larger New Year's Eve fireworks, as the sale of fireworks to the public was progressively banned by the states in the 1980s, and by the Australian Capital Territory on 24 August 2009.
Split into simpler sentences: Although they occasionally still occur, the tradition has since been overshadowed by larger New Year's Eve fireworks. The sale of fireworks to the public was progressively banned by the states in the 1980s, and by the Australian Capital Territory on 24 August 2009.