Complex sentence: The North Coast of California (also called the Redwood Empire or the Redwood Coast) is a region which commonly includes Mendocino, Humboldt, and Del Norte counties and sometimes includes two counties from the San Francisco Bay area, Marin and Sonoma.
Split into simpler sentences: The North Coast of California (also called the Redwood Empire or the Redwood Coast) is a region which commonly includes Mendocino, Humboldt, and Del Norte counties. Also including two counties from the San Francisco Bay area, Marin and Sonoma.