Complex sentence: Markel writes extensively on major topics and figures in the history of medicine and public health, is a best-selling author, and is editor-in-chief of the health care policy journal The Milbank Quarterly.
Split into simpler sentences: Markel writes extensively on major topics and figures in the history of medicine and public health. He is a best-selling author and is editor-in-chief of the health care policy journal The Milbank Quarterly.