Simplify the following text for a Grade 9 native English-speaking person.
Original: jpg thumb ( width in number of pixels ) px right Johnny Weissmuller at the 1924 Olympic Games ) ) Johnny Weissmuller ( June 2 , 1904 â `` January 20 , 1984 ) was an American swimmer and actor .
Simplified: Johnny Weissmuller ( born Johann Peter WeiÃ mÃ 1\/4 ller ; June 2 , 1904 -- January 20 , 1984 ) was an Austro-Hungarian-born American swimmer and actor .