Complex sentence: The area of responsibility for the "Hurricane Hunters" is from midway through the Atlantic Ocean west to the Hawaiian Islands, although they have also been tasked to fly into typhoons in the Pacific Ocean on occasion, as well as gather data in winter storms.
Split into simpler sentences: The area of responsibility for the "Hurricane Hunters" is midway through the Atlantic Ocean to the Hawaiian Islands. The Hurricane Hunters have also been tasked to fly into typhoons in the Pacific Ocean on occasion, as well as gather data in winter storms.