Original sentence: It is exceptionally difficult to determine the exact extent of neo-Nazi organizations, because these groups are aware that public opinion concerning them is extremely negative, not to mention the existence of organizations dedicated to monitoring their activities (such as ADL and SPLC).While a small minority of neo-Nazis continue to draw public attention, the vast majority operate underground, in order that they may recruit, organize and fund-raise without interference
Edited sentence: It is exceptionally difficult to determine the exact extent of neo-Nazi organizations, because these groups are aware that public opinion concerning them is extremely negative, not to mention the existence of organizations dedicated to monitoring their activities (such as ADL and SPLC), and so while a small minority of neo-Nazis continue to draw public attention, the vast majority operate underground, in order that they may recruit, organize and fund-raise without the constant attacks which defend the free world against those few groups which regretfully have gone public