Simplify the following text for a Grade 11 native English-speaking person.
Original: On 9 January 1992 , the Bosnian Serb Assembly proclaimed the Republic of the Serb people of Bosnia and Herzegovina ( Ð Ð Ð Ñ Ð Ð '' Ð Ð Ð Ñ Ñ Ð Ñ Ð Ð 3\/4 Ð Ð 1\/2 Ð Ñ Ð 3\/4 Ð Ð Ð ` Ð 3\/4 Ñ Ð 1\/2 Ð Ð Ð Ð Ñ Ñ Ð Ð Ð 3\/4 Ð Ð Ð 1\/2 Ð \/ Republika srpskog naroda Bosne i Hercegovine ) .
Simplified: Radovan KaradÅ 3\/4 iÄ ( Serbian Cyrillic : Ð Ð Ð Ð 3\/4 Ð Ð Ð 1\/2 Ð Ð Ñ Ð Ñ Ð Ñ ; born June 19 , 1945 in Petnjica , Montenegro , Yugoslavia ) is a former Serb politician .