Complex sentence: This also included the prefixing of all JEA flights with the former BEA two-letter, IATA airline identification code BE, which continued in use when JEA rebranded as "Flybe" on 18 July 2002.
Split into simpler sentences: This also included the prefixing of all JEA flights with the airline identification code BE which had been BEA's two-letter IATA code. The use of the code continued after JEA rebranded as "Flybe" on 18 July 2002.