Complex sentence: The 1979 Pacific hurricane season was at the time the most inactive Pacific hurricane season that officially started on May 15,1979 in the eastern Pacific, and June 1,1979 in the central Pacific, and lasted until November 30,1979.
Split into simpler sentences: The 1979 Pacific hurricane season was at the time the most inactive Pacific hurricane season. It officially started on May 15,1979 in the eastern Pacific, and June 1,1979 in the central Pacific, and lasted until November 30,1979.