Simplify the following text for a Grade 9 native English-speaking person.
Original: Formed out of school bands Garden Wall and The Anon , Genesis 's original line-up consisted of Peter Gabriel ( vocals ) , Anthony Phillips ( guitar ) , Tony Banks ( keyboards ) , Mike Rutherford ( bass & guitar ) and Chris Stewart ( drums ) .
Simplified: Over the years , Genesis has changed members more than once . The first line-up was Peter Gabriel ( vocals ) , Anthony Phillips ( guitar ) , Tony Banks ( keyboards ) , Mike Rutherford ( bass & guitar ) , and Chris Stewart ( drums ) .