Simplify the following text for a Grade 8 native English-speaking person.
Original: Glen Matlock ( born 27 August 1956 , Paddington , West London ) is an English bass guitarist most famous for being in the original line-up of the punk rock band Sex Pistols .
Simplified: Glen Matlock ( Greenford , August 27 1956 ) is the first bassist of the British punk group Sex Pistols .