Complex sentence: In the South Bay and further inland, while the wet season is cool and mild, the summer dry season is characterized by warm sunny days, while in San Francisco and areas closer to the Golden Gate strait, the dry season is periodically affected by fog.
Split into simpler sentences: In the South Bay and further inland, while the wet season is cool and mild, the summer dry season is characterized by warm sunny days. In San Francisco and areas closer to the Golden Gate strait, the dry season is periodically affected by fog.