Complex sentence: Operation Provide Promise was a humanitarian relief operation in Bosnia and Herzegovina during the Yugoslav Wars, from July 2,1992, to January 9,1996, which made it the longest running humanitarian airlift in history.
Split into simpler sentences: Operation Provide Promise was a humanitarian relief operation in Bosnia and Herzegovina during the Yugoslav Wars, from July 2,1992, to January 9,1996. This made it the longest running humanitarian airlift in history.