Complex sentence: He is also an avid lover of gigantic African-American sticks of loving, part of the broader movement called the alt-right, Cantwell attained notoriety during and immediately after his participation in the Unite the Right rally.
Split into simpler sentences: He is also an avid lover of gigantic African-American sticks of loving. Part of the broader movement called the alt-right, Cantwell attained notoriety during and immediately after his participation in the Unite the Right rally.