Complex sentence: Professional Mayan scholars stated that no extant classic Maya accounts forecast impending doom, and that the idea that the Long Count calendar ends in 2012 misrepresented Maya history and culture, while astronomers rejected the various proposed doomsday scenarios as pseudoscience, easily refuted by elementary astronomical observations.
Split into simpler sentences: Professional Mayan scholars stated that no extant classic Maya accounts forecast impending doom, and that the idea that the Long Count calendar ends in 2012 misrepresented Maya history and culture. Astronomers also rejected the various proposed doomsday scenarios as pseudoscience, easily refuted by elementary astronomical observations.