Complex sentence: The IBA was expected to close down on 15 May 2017 before the IPBC was expected to launch however on 9 May 2017 the IBA was unexpectedly closed down after the final broadcast of their regular nightly news programme.
Split into simpler sentences: The IBA was expected to close down on 15 May 2017 before the IPBC was expected to launch. However on 9 May 2017 the IBA was unexpectedly closed down after the final broadcast of their regular nightly news programme.