Complex sentence: The Indianapolis Flood Control District coordinated the large-scale projects, with the Works Progress Administration, the U.S. Army Corps of Engineers, and the Indiana Flood Control and Water Resources Commission providing regulatory oversight and some financial support.
Split into simpler sentences: The Indianapolis Flood Control District coordinated the large-scale projects. The Works Progress Administration, the U.S. Army Corps of Engineers, and the Indiana Flood Control and Water Resources Commission providing regulatory oversight and some financial support.