Original sentence: Holocaust denial refers to the claims of historians who argue that the Holocaust, as known to history, is either highly exaggerated or otherwise completely falsified.Such claims have led a number of other historians and some first-hand witnesses to forcefully debunk them and their authors
Edited sentence: Holocaust denial refers to the claims of a small group of amateur and academic historians who argue that the Holocaust, as known to history, is either highly exaggerated or otherwise completely falsified.Such claims have led a number of experts, historians, and even first-hand witnesses to forcefully debunk them and their authors