Complex sentence: WGME operates out of their Portland studio, but also operates two bureaus in Auburn, serving the Lewiston/Auburn area of the Portland market, and in Augusta, near the State House.
Split into simpler sentences: WGME operates out of its principal Portland studio, but also operates two regional bureaus. One is in Auburn, serving the Lewiston/Auburn area of the Portland market, and one in Augusta, near the State House.