Complex sentence: The roots of this model lie in the writings of Marx and Engels, who attempted to show through analysis how the ideology of capitalism, which so thoroughly benefited the social elite, was sold to the working class despite being against their own interests.
Split into simpler sentences: The roots of this model lie in the writings of Marx and Engels. Their conclusion was that the ideology of capitalism, which so thoroughly benefited the social elite, was adopted by the working class despite being against their own interests.