Complex sentence: Manchester 1, Birmingham 1 and Kent were not shown during the original run but first aired in 2008, two years later than the premiere of series three and a few months after series four had aired.
Split into simpler sentences: Manchester 1, Birmingham 1 and Kent were not shown during the original run but first aired in 2008. Two years later than the premiere of series three, and a few months after series four had aired.