Simplify the following text for a Grade 10 native English-speaking person.
Original: The Beringian land bridge is believed to have existed both in the glaciation that occurred before 35,000 Before Present ( BP ) and during the more recent period 22,000-7 ,000 years BP .
Simplified: The Beringian land bridge is believed to have existed both in the glaciation that occurred before 35,000 BP and during the more recent period 22,000-7 ,000 years Before Present .