Complex sentence: Conservative billionaires used secretive funding to channel nearly $120m (£77m) to more than 100 groups casting doubt about the science behind climate change; thereby attempting to create doubt in order to protect oil company revenues.
Split into simpler sentences: Conservative billionaires used a secretive funding route to channel nearly $120m (£77m) to more than 100 groups casting doubt about the science behind climate change. They are attempting to create doubt in order to protect oil company revenues.