Simplify the following text for a Grade 9 native English-speaking person.
Original: Originally named Warsaw , the band primarily consisted of Ian Curtis ( vocals and occasional guitar ) , Bernard Sumner ( guitar and keyboards ) , Peter Hook ( bass guitar and backing vocals ) and Stephen Morris ( drums and percussion ) .
Simplified: It was made up of Ian Curtis ( vocals ) , Peter Hook ( bass guitar ) , Stephen Morris ( drums ) and Bernard Albrecht ( AKA Sumner , guitar ) .