Simplify the following text for a Grade 8 native English-speaking person.
Original: Sharon Arden , ( later Sharon Osbourne ) daughter of Black Sabbath manager Don Arden , suggested former Rainbow vocalist Ronnie James Dio to replace Ozzy Osbourne in 1979 .
Simplified: Ozzy Osbourne was fired from the band in 1979 because of his drug and alcohol addiction . American vocalist Ronnie James Dio was hired to replace him .