Simplify the following text for a Grade 8 native English-speaking person.
Original: Gaedel gained immortality in the second game of a doubleheader on Sunday , August 19 , 1951 .
Simplified: Gaedel ( some sources say the family name may actually have been Gaedele ) gained immortality in the second game of a St. Louis Browns doubleheader on Sunday , Aug. 19 , 1951 .