Complex sentence: The group influenced the work of many successful, mainstream bands, and are now considered one of the most crucial bands to Australia's musical growth, but their main legacy was their towering influence over Australian indie rock in the 1980s.
Split into simpler sentences: The group influenced the work of many successful, mainstream bands, and are now considered instrumental in Australia's musical growth. Some say that their main legacy was their towering influence over Australian indie rock in the 1980s.