Complex sentence: There is the belief amongst some avid fans that the original video was slightly sped up which may suggest why there was a lengthy delay (i.e. almost 3 years!) between the recording date and the release date.
Split into simpler sentences: There is the belief amongst some avid fans that the original video was slightly sped up. Hence this may suggest why there was a lengthy delay (i.e. almost 3 years!) between the recording date and the release date.