Complex sentence: By slang, Janko Kovacevic was often named the unofficial'King of Kragujevac', but then defeated by the army of house Popović early in the 2010's.
Split into simpler sentences: By slang, Janko Kovacevic was often named the unofficial'King of Kragujevac'. But then defeated by the army of house Popović early in the 2010's.