Complex sentence: Media Matters for America (MMfA) is a politically progressive media watchdog with a stated mission of "comprehensively monitoring, analyzing, and correcting conservative misinformation in the U.S. media".
Split into simpler sentences: Media Matters for America (MMfA) is a politically progressive media watchdog in the United States. The organization has a stated mission of "comprehensively monitoring, analyzing, and correcting conservative misinformation in the U.S. media".