Complex sentence: Goran "Majmun" Vuković (1959--12 December 1994) was a Serbian gangster who earned his nickname "Majmun" ('Monkey') due to his unique style of breaking into buildings: climbing and jumping balconies to enter a premises.
Split into simpler sentences: Goran "Majmun" Vuković (1959--12 December 1994) was a Serbian gangster. Vukovic earned his nickname "Majmun" ('Monkey') due to his unique style of breaking into buildings: climbing and jumping balconies to enter a premises.