Simplify the following text for a Grade 10 native English-speaking person.
Original: Beverly Sills ( May 25 , 1929 - July 2 , 2007 ) is an American operatic soprano particularly associated with Italian bel canto and French operas .
Simplified: Beverly Sills ( May 25 , 1929-July 2 , 2007 ) was an American operatic soprano whose peak career was between the 1950s and 1970s .