Complex sentence: The Collector Edition, for which the content has never been revealed, was available to pre-order only on Amazon sites worldwide; however, on September 30,2009, Amazon announced this collector edition had been canceled.
Split into simpler sentences: The Collector Edition, for which the content has never been revealed, was available to pre-order only on Amazon sites worldwide. However, on September 30,2009, Amazon announced this collector edition had been canceled.