Simplify the following text for a Grade 10 native English-speaking person.
Original: Irmgard Seefried ( born KÃ ngetried , Bavaria , 9 October 1919 ; died Vienna , 24 November 1988 ) was a famous German soprano who sang opera and lieder .
Simplified: Irmgard Seefried ( 9 October 1919-24 November 1988 ) was a distinguished German soprano who sang opera and lieder .