Complex sentence: The storyline in which he appears is published as part of the filenames of the Monday through Saturday comic strip image files, which consist of the date (in mmddyy format) followed by the next one to three words of the story.
Split into simpler sentences: The storyline in which he appears is told within the filenames of the image files Monday through Saturday. The filenames consist of the date (in mmddyy format) and a few words of the story.