Complex sentence: The Albatross was designed for optimal seas, and could land in more severe conditions, but required JATO (jet-assisted take off, or simply booster rockets) for takeoff in seas or greater.
Split into simpler sentences: The Albatross was designed for optimal seas, and could land in more severe conditions. Take offs could require JATO (jet-assisted take off, or simply booster rockets) in seas or greater.