Complex sentence: Shortly after reporting the Sierra fix ten miles south of the Kathmandu VOR, the aircraft called ATC asking for a diversion to Calcutta, India because of a "technical problem"; before ATC could reply, the flight rescinded their previous transmission.
Split into simpler sentences: Shortly after reporting the Sierra fix ten miles south of the Kathmandu VOR, the aircraft called ATC asking for a diversion to Calcutta, India because of a "technical problem". Before ATC could reply, the flight rescinded their previous transmission.