Complex sentence: His use of his land was restricted due to Australia's commitments to the Kyoto Protocol and he was refused compensation as it was the New South Wales government, and not the federal government in Canberra, which had enacted the laws to combat Global Warming.
Split into simpler sentences: His use of his land was restricted due to Australia's commitments to the Kyoto Protocol. He was refused compensation as it was the New South Wales government, and not the federal government in Canberra, which had enacted the laws in question which were intended to combat global warming.