Complex sentence: Most known populations of "Lomatium bradshawii" are within ten miles of Eugene, Oregon; in Willamette Valley populations exist in the Oregon counties Lane, Benton, Linn, and Marion County, and in Washington "Lomatium bradshawii" grows in Puget Sound.
Split into simpler sentences: Most known populations of "Lomatium bradshawii" are within ten miles of Eugene, Oregon. In Willamette Valley populations exist in the Oregon counties Lane, Benton, Linn, and Marion County, and in Washington "Lomatium bradshawii" grows in Puget Sound.