Simplify the following text for a Grade 10 native English-speaking person.
Original: Prehistoric Britain is the period between the arrival of the first humans in Great Britain and the start of recorded British history . The history of Britain is conventionally reckoned to begin in AD 43 with the Roman invasion of Britain , though some historical information is available from before this .
Simplified: Prehistoric Britain was a period in the human occupation of Great Britain that ended with the Roman invasion of Britain in AD 43 .