Task: Text Simplification
Input (English): Bjo ̈ rn Rune Borg ( -RSB- ; born 6 June 1956 ) is a Swedish former world No. 1 tennis player widely considered to be one of the greatest players in the history of the sport .
Output (English): Bjo ̈ rn Borg ( born June 6 , 1956 ) is a retired professional tennis player from Sweden .