Complex sentence: During much of the planning and construction phase, the new airport was known as Berlin Brandenburg International Airport, abbreviated BBI, until it was discovered that the IATA code BBI already referred to Biju Patnaik International Airport, also known as Bhubaneswar Airport, in India.
Split into simpler sentences: During much of the planning and construction phase the new airport was known as Berlin Brandenburg International Airport, abbreviated BBI. It was then discovered that the IATA code BBI already referred to Biju Patnaik International Airport, (also known as Bhubaneswar Airport) in India.