Complex sentence: The "BBC Nine O'Clock News" was the flagship BBC News programme launched on 14 September 1970, and ran until 15 October 2000, when it was controversially moved to "BBC News at Ten".
Split into simpler sentences: The "BBC Nine O'Clock News" was the flagship BBC News programme. It was launched on 14 September 1970 and ran until 15 October 2000, when it was controversially replaced by "BBC News at Ten".