Complex sentence: When the BBC entered the "Digital Age" it introduced a television channel called BBC Knowledge with an aim of providing cultural and educational programming, which was later shutdown and its spectrum split between CBeebies (6am--7pm) and BBC Four (after 7pm).
Split into simpler sentences: When the BBC entered the "Digital Age", it introduced a television channel called BBC Knowledge with an aim of providing cultural and educational programming. It was later shutdown, and its spectrum was split between CBeebies (6am--7pm) and BBC Four (after 7pm).