Complex sentence: In the 1980s, Boeing launched the longer -300, -400, and -500 models, subsequently referred to as the Boeing 737 Classic series and featuring CFM56 turbofan engines along with wing improvements.
Split into simpler sentences: In the 1980s, Boeing launched the -300, -400, and -500 models, subsequently referred to as the Boeing 737 Classic series. The 737 Classics added capacity and incorporated CFM56 turbofan engines along with wing improvements.