Complex sentence: Greene is also the ancestor of General Nathanael Greene, the only general in the American Revolutionary War, besides George Washington, to serve for the entire war, and of former United States President Warren G. Harding.
Split into simpler sentences: Greene is also the ancestor of General Nathanael Greene, the only general in the American Revolutionary War, besides George Washington, to serve for the entire war. He is also the ancestor of United States President Warren G. Harding.