Complex sentence: Bearman is the author of "Doormen" (University of Chicago Press, 2005) an ethnographic study of Doormen in New York City, as well as being the author of numerous articles in historical and general sociology.
Split into simpler sentences: Bearman is the author of "Doormen" (University of Chicago Press, 2005) an ethnographic study of Doormen in New York City. He is also the author of numerous articles in historical and general sociology.