Complex sentence: Center for Resource Solutions (CRS) is a nonprofit based in the Presidio in San Francisco, CA that works to promote the retail renewable energy market in the United States by developing consumer-protection programs in renewable energy, greenhouse gas reductions, and energy efficiency.
Split into simpler sentences: Center for Resource Solutions (CRS) is a nonprofit organization based in the Presidio in San Francisco, California. It works to promote the retail renewable energy market in the United States by developing consumer-protection programs in renewable energy, greenhouse gas reductions, and energy efficiency.