Simplify the following text for a Grade 9 native English-speaking person.
Original: None of the pre-Roman inhabitants of Britain had any written language , so their history , culture and way of life are known only through archaeological finds .
Simplified: However , none of the pre-Roman inhabitants of Britain have any known surviving written language . No literature of pre-Roman Britain has survived , so its history , culture and way of life are known mainly through archaeological finds .