Complex sentence: U.S. Route 199 is a U.S. Highway in the U.S. states of California and Oregon, numbered as a spur of U.S. Route 99, which no longer exists.
Split into simpler sentences: U.S. Route 199 is a U.S. highway in the U.S. states of California and Oregon. It is numbered as a spur of U.S. Route 99, which no longer exists.