Complex sentence: He is well-known for contributions to embodied philosophy, cognitive science and cognitive linguistics with George Lakoff, but he has also written extensively on philosophical topics such as John Dewey, Kant and ethics.
Split into simpler sentences: He is well-known for contributions to embodied philosophy, cognitive science and cognitive linguistics, some of which he has coauthored with George Lakoff. However, he has also written extensively on philosophical topics such as John Dewey, Kant and ethics.