Simplify the following text for a Grade 12 native English-speaking person.
Original: The band is composed of Damian Kulash ( lead vocals and guitar ) , Tim Nordwind ( bass guitar and vocals ) , Dan Konopka ( drums and percussion ) and Andy Ross ( guitar , keyboards and vocals ) , who joined them in 2005 , replacing Andy Duncan .
Simplified: The band members are Damian Kulash ( lead vocals and guitar ) , Tim Nordwind ( bass guitar and backing vocals ) , Dan Konopka ( drums and percussion ) and Andy Ross ( keyboards , guitar and backing vocals ) .