Simplify the following text for a Grade 8 native English-speaking person.
Original: Ancient Greece is the civilization belonging to the period of Greek history lasting from the Archaic period of the 8th to 6th centuries BC to 146 BC and the Roman conquest of Greece after the Battle of Corinth .
Simplified: It was the civilization of Greece from the Archaic period of the 8th\/6th centuries BC to 146 BC . The period ended with the Roman conquest of Greece in the Battle of Corinth .