Simplify the following text for a Grade 7 native English-speaking person.
Original: Black Sabbath were an English rock band , formed in Aston , Birmingham in 1969 by Ozzy Osbourne ( lead vocals ) , Tony Iommi ( guitar ) , Geezer Butler ( bass guitar ) , and Bill Ward ( drums ) .
Simplified: The original line up was Ozzy Osbourne ( vocals ) , Tony Iommi ( guitar ) , Terence `` Geezer '' Butler ( bass ) and Bill Ward ( drums ) . Black Sabbath formed in 1968 .