Complex sentence: It came up with a thing called global warming which he labelled "nonsense" and stated that "we have to come to a conclusion that climate change is not so much a scientific thing as it is a political thing".
Split into simpler sentences: It came up with a thing called global warming, which he labelled "nonsense". He went on to say that "we have to come to a conclusion that climate change is not so much a scientific thing as it is a political thing".