Complex sentence: He is the founder and former director of left-wing think tank, The Australia Institute He is well known as a climate change advocate and a public intellectual, regularly appearing in the Australian media and contributing to public policy debates.
Split into simpler sentences: He is the founder and former director of left-wing think tank, The Australia Institute. Hamilton is well known as a climate change advocate and a public intellectual, regularly appearing in the Australian media and contributing to public policy debates.