Simplify the following text for a Grade 8 native English-speaking person.
Original: Sir Alexander Chapman `` Alex '' Ferguson , CBE , popularly known as Sir Alex or Fergie ( born 31 December 1941 in Govan , Glasgow ) is a Scottish football manager and former player , currently managing Manchester United , where he has been in charge since 1986 .
Simplified: Sir Alex Ferguson ( born 31 December 1941 ) is a Scottish football manager .