Complex sentence: Houston Intercontinental Airport (IAH), now George Bush Intercontinental Airport, opened in 1969 because of expansion limitations at Hobby, and all airlines serving Hobby then moved their operations to Intercontinental and Hobby was left without any scheduled passenger airline service.
Split into simpler sentences: Houston Intercontinental Airport (IAH), now George Bush Intercontinental Airport, opened in 1969 because of expansion limitations at Hobby. All airlines serving Hobby then moved their operations to Intercontinental and Hobby was left without any scheduled passenger airline service.