Simplify the following text for a Grade 8 native English-speaking person.
Original: During his career Gillan also fronted his own band , had a year-long stint as the vocalist for Black Sabbath , and sang the role of Jesus in the original recording of Andrew Lloyd Webber 's rock opera Jesus Christ Superstar .
Simplified: Gillan is also noted for singing the part of Jesus on the original rock opera concept album Jesus Christ Superstar . Gillan later became lead singer of Black Sabbath .