Complex sentence: PAG is based in London, and its North American Headquarters in Irvine, California which is the first Ford building, and the first building in Orange County, to qualify for Leadership in Energy and Environmental Design Certification from the U.S. Green Building Council.
Split into simpler sentences: PAG is based in London, and its North American headquarters are located in Irvine, California. The PAG office in the U.S. is the first Ford building, and the first building in Orange County, to qualify for Leadership in Energy and Environmental Design Certification from the U.S. Green Building Council.