Complex sentence: He tackled official corruption by dismissing Smith's cronies and instituting a Public Service Commission, and took action to address New York's growing need for power through the development of hydroelectricity on the St. Lawrence River.
Split into simpler sentences: He tackled official corruption by dismissing Smith's cronies and instituting a Public Service Commission. He addressed New York's growing need for power through the development of hydroelectricity on the St. Lawrence River.