Simplify the following text for a Grade 11 native English-speaking person.
Original: For his political and literary work , StarÄ eviÄ is commonly called Father of the Nation ( Otac domovine ) among Croats , a name first used by Eugen Kvaternik while StarÄ eviÄ was still alive .
Simplified: For his political activity and literary work , StarÄ eviÄ is commonly called Father of the Nation ( Otac domovine ) in Croatia .