Complex sentence: Keynesian views eventually entered the mainstream as a result of the Keynesian-neoclassical synthesis developed by John Hicks, but advocates of a more fundamental critique formed a school of Post-Keynesian economics.
Split into simpler sentences: Keynesian views eventually entered the mainstream as a result of the Keynesian-neoclassical synthesis developed by John Hicks. However, advocates of a more fundamental critique of orthodox economics formed a school of Post-Keynesian economics.