Simplify the following text for a Grade 6 native English-speaking person.
Original: Kim Kibum , better known by his stage name Key , is a Main Vocalist , one of the two Rappers and is considered one of the two Lead Dancers of the group .
Simplified: Kim Kibum ( ê ê ë '' ) , born , better known by his stage name Key ( í ) , is one of the rappers in the group .