Complex sentence: It is listed as a noxious weed by the agriculture departments of several states in the western United States, Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming.
Split into simpler sentences: It is listed as a noxious weed by the agriculture departments of several states in the western United States. These states include Arizona, Califonia, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming.