Complex sentence: The policies of the Republicans in power have been exclusively economic, but the coalition has caused the social conservatives to be worse off, due to these very economic policies and because the social issues that this faction pushes never go anywhere after the election.
Split into simpler sentences: The policies of the republicans in power have been exclusively economic, but the coalition has caused the social conservatives to be worse off, due to these very economic policies. That, plus the fact that the social issues that this faction pushes never go anywhere after the election.