Simplify the following text for a Grade 15 native English-speaking person.
Original: The second major phase in the break-up of Pangaea began in the Early Cretaceous ( 150 â `` 140 Ma ) , when the minor supercontinent of Gondwana separated into multiple continents ( Africa , South America , India , Antarctica , and Australia ) .
Simplified: The second major phase in the break-up of Pangaea began in the Lower Cretaceous ( 150 â `` 140 Ma ) , when Gondwana separated into multiple continents ( Africa , South America , India , Antarctica , and Australia ) .