Original sentence: Others, however, noted that this same era allowed Jews, for the first time, the ability to easily assimilate into Christian society; this was a powerful attraction for many Jews, since only by becoming a Christian (at least nominally) would one be certain to have equal rights and civil liberties
Edited sentence: Others, however, noted that this same era threatened Jews, for the first time, with easy assimilation into Christian society; this was a powerful attraction for many Jews, since only by becoming a Christian (at least nominally) would one be certain to have equal rights and civil liberties