Complex sentence: In 2009, Green Bay, Wisconsin officials began a campaign to have US 41 designated as a northern extension of Interstate 55 from its current termination in Chicago, with the alternative being the road as a spur of I-43.
Split into simpler sentences: In 2009, Green Bay, Wisconsin officials have begun a campaign to have US 41 designated as a northern extension of I-55 from its current termination in Chicago. The alternative is designating the road as a spur of I-43.