Simplify the following text for a Grade 9 native English-speaking person.
Original: George Michael ( born Georgios Kyriacos Panayiotou ; on 25 June 1963 ) is an English musician , singer-songwriter and record producer who rose to fame in the 1980s when he formed the pop duo Wham !
Simplified: George Michael ( born Georgios Kyriacos Panayiotou , 25 June 1963 ) is a two-time Grammy Award winning English singer-songwriter .