Complex sentence: In San Francisco and Alameda County (Oakland and Berkeley), four out of five voters backed the Democratic candidate-elsewhere in the Bay, Obama won every county by a 3-2 margin or greater.
Split into simpler sentences: In San Francisco and Alameda County (which encompass Oakland and Berkeley), four out of five voters backed the Democratic candidate. Elsewhere in the Bay Area, Obama won every county by a three to two margin or greater.