Complex sentence: SR 52 is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System; however, it is not a scenic highway as designated by Caltrans because it has not successfully been through the nomination process.
Split into simpler sentences: SR 52 is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. However, it is not a scenic highway as designated by Caltrans because it has not successfully been through the nomination process.