Complex sentence: During that time he did foundational work in the critique of modern and postmodern philosophy and was instrumental in bringing scientist-philosopher Michael Polanyi and his Post-critical epistemology to the United States.
Split into simpler sentences: During that time he did foundational work in the critique of Modern and Postmodern intellectual culture. He was instrumental in introducing scientist-philosopher Michael Polanyi and his Post-Critical philosophy to the United States.