Complex sentence: The Pakistan Air Force figures have been disputed by Indian sources which claim Alam made four kills, attributing one of the losses of Sqn Ldr Onkar Nath Kacker's aircraft to booster failure.
Split into simpler sentences: The Pakistan Air Force figures have been disputed by Indian sources which award Alam with four kills. They attribute one of the loss of Sqn Ldr Onkar Nath Kacker's aircraft to booster failure.