Complex sentence: They switched on their missile radars sparingly, giving the F-16 pilots little warning and waited till it was directly overhead, where the aircraft's warning and countermeasures would be at its weakest, they fired two missiles skyward.
Split into simpler sentences: They switched on their missile radars sparingly, giving the F-16 pilots little warning. Waiting till it was directly overhead, where the aircraft's warning and countermeasures would be at its weakest, they fired two missiles skyward.