Complex sentence: On arrival at the aircraft the rescue personnel did not immediately attempt to open any of the aircraft doors as the engines on the wings were still running, the remaining two engines were shut down three minutes and 15 seconds after the aircraft came to a stop.
Split into simpler sentences: On arrival at the aircraft the rescue personnel did not immediately attempt to open any of the aircraft doors as the engines on the wings were still running. These two engines were shut down three minutes and 15 seconds after the aircraft came to a stop.