Complex sentence: For over 35 years, George Tchobanoglous taught courses on water and wastewater treatment and solid waste management at the University of California, Davis, where he is a professor emeritus in the Department of Civil and Environmental Engineering.
Split into simpler sentences: For over 35 years he served on the faculty of the University of California, Davis, teaching courses on water and wastewater treatment and solid waste management. He is now a professor emeritus in the university's Department of Civil and Environmental Engineering.