Simplify the following text for a Grade 11 native English-speaking person.
Original: Evidence of Neanderthal occupation of Britain is limited and by 30,000 BC the first signs of modern human ( Homo sapiens ) activity , the Aurignacian industry , are known .
Simplified: Neanderthal occupation of Britain was limited and by 30,000 BC the first signs of modern human ( Homo sapiens ) activity .