Complex sentence: The original collection was 26 issues long with each tape lasting up to 45 minutes, except for issue 26 which was 90 minutes long because it also contained the special preview issue for "Story Teller 2" which immediately followed the original series.
Split into simpler sentences: The original collection was 26 issues long with each tape lasting up to 45 minutes. An exception was issue 26, which was 90 minutes long because it also contained the special preview issue for "Story Teller 2", which immediately followed the original series.