Before revision: Adolf Hitler, Führer of Germany (1933-1945), whose mannerisms, expressions as well as speaking are commonly used as an instance of persuasion used in order to convince a group behind one's own objective.
After revision: Adolf Hitler, Führer of Germany (1933-1945), whose mannerisms, expressions as well as speaking are frequently used as an instance of persuasion used in order to convince a group behind one's own objective.