Complex sentence: Some were the United States Chamber of Commerce, the Association of California County Treasurers, the Soroptimist Club of San Francisco, the San Francisco Board of Supervisors, the U.S. Small Business Administration, the California Lieutenant Governors' Club and the San Francisco Opera.
Split into simpler sentences: Some were the United States Chamber of Commerce, the Association of California County Treasurers and the Soroptimist Club of San Francisco. Many organizations, including the San Francisco Board of Supervisors, the U.S. Small Business Administration, the California Lieutenant Governors' Club and the San Francisco Opera.