Simplify the following text for a Grade 9 native English-speaking person.
Original: On July 30 it was classified as Tropical Depression Three and was named Tropical Storm Chantal shortly thereafter while south of Nova Scotia .
Simplified: Late on July 30 , it was upgraded to a tropical depression , the third of the season , after developing deep convection near the center for most of the day . On July 31 , the system strengthened into a tropical storm south of Nova Scotia , the first storm in nearly two months after Barry .