Complex sentence: Currently, the U.S. units that fly these missions are the United States Air Force Reserve's 53d Weather Reconnaissance Squadron and the National Oceanic and Atmospheric Administration's Hurricane Hunters; such missions have also been flown by Navy units and other Air Force and NOAA units.
Split into simpler sentences: Currently, the US organizations that fly these missions are the United States Air Force Reserve's 53d Weather Reconnaissance Squadron and the National Oceanic and Atmospheric Administration's Hurricane Hunters. Such missions have also been flown by Navy units and other Air Force and NOAA units.