Simplify the following text for a Grade 9 native English-speaking person.
Original: The Southern Carpathians or the Transylvanian Alps are a group of mountain ranges which divide central and southern Romania , on one side , and Serbia , on the other side .
Simplified: The Southern Carpathians ( Romanian : CarpaÅ # ii Meridionali ) , also called the Transylvanian Alps , are a group of mountain ranges . They divide central and southern Romania , on one side , and Serbia , on the other side .