Complex sentence: Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma, while other sources may exclude parts of or even entire counties, or include neighboring counties such as Santa Cruz and San Joaquin.
Split into simpler sentences: Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma. Other sources may exclude parts of or even entire counties, or include neighboring counties such as Santa Cruz and San Joaquin.