Complex sentence: On 23 July 1983 flight 143 was cruising at 41000 ft, over Red Lake, Ontario, the aircraft's cockpit warning system sounded, indicating a fuel pressure problem on the aircraft's left side.
Split into simpler sentences: On 23 July 1983 flight 143 was cruising at 41000 ft, over Red Lake, Ontario. The aircraft's cockpit warning system sounded, indicating a fuel pressure problem on the aircraft's left side.