Original sentence: "Extremism" is a term used to describe the actions or ideologies of individuals or groups outside the perceived political center of a society; or otherwise claimed to violate common standards of ethics and reciprocity
Edited sentence: "Extremism" is a term ostensibly used to describe the actions or ideologies of individuals or groups outside the perceived political center of a society; or otherwise claimed to violate common standards of ethics and reciprocity.It should be pointed out that it is controversial whether "extremism" is a coherent concept, or - expressing this caveat in the material mode - whether extremism exists, or indeed could exist