Original: Gary Wayne Coleman ( born February 8 , 1968 ) is an American actor , best known for his role as Arnold Jackson in the American sitcom Diff ` rent Strokes ( 1978 -- 1986 ) .
Simplified: Gary Wayne Coleman ( born February 8 , 1968 ) is an American actor . He is famous for his role as Arnold Jackson in the American sitcom Diff ` rent Strokes .