Complex sentence: The meme includes the assertion that it is currently International Book Week, and that the reader should repeat this statement to others, although no dates are given, and there is no instruction to stop copying the meme when the week is over.
Split into simpler sentences: The meme includes the assertion that it is currently International Book Week, and that the reader should repeat this statement to others. No start or end date is specified for the week, and there is no instruction to stop copying the meme once the week is over.