Complex sentence: The Wisconsin State Trunk Highway System is the state highway system of the U.S. state of Wisconsin, including Wisconsin's segments of the Interstate Highway System and the United States Numbered Highway System, in addition to its other state trunk highways.
Split into simpler sentences: The Wisconsin State Trunk Highway System is the state highway system of the U.S. state of Wisconsin. The system includes Wisconsin's segments of the Interstate Highway System and the United States Numbered Highway System, in addition to its other state trunk highways.