Complex sentence: The Tan Son Nhut C-5 accident refers to the 4 April 1975 crash of 68-0218, a Lockheed C-5A Galaxy participating in Operation Babylift, which crashed on approach to an emergency landing at Tan Son Nhut Air Base, South Vietnam.
Split into simpler sentences: The Tan Son Nhut C-5 accident refers to the 4 April 1975 crash of Lockheed C-5A Galaxy serial number "68-0218" participating in Operation Babylift. The C-5 crashed on approach during an emergency landing at Tan Son Nhut Air Base, South Vietnam.