Original sentence: Since the aim of Holocaust deniers is to prove that the Holocaust did not happen, there has been substantial debate on the right way to respond to deniers.They address the arguments and claims made by Holocaust denial groups by pointing out the errors of their evidence
Edited sentence: Since the aim of Holocaust deniers is to prove that the Holocaust did not happen, a conclusion contradicted by the historical record, there has been substantial debate on the right way to respond to deniers.They address the arguments and claims made by Holocaust denial groups by pointing the errors of their evidence