Complex sentence: He also told the inquiry that Advance checked for water in the fuel system each time the aircraft was refuelled, when he operated the aircraft on scheduled flights the day prior to the accident, the aircraft performed "quite well".
Split into simpler sentences: He also told the inquiry that Advance Airlines checked for water in the fuel system each time the aircraft was refuelled. When he operated the aircraft on scheduled flights the day prior to the accident, the aircraft performed "quite well".