Simplify the following text for a Grade 7 native English-speaking person.
Original: The fourth named storm of the season , Dog developed on August 30 to the east of Antigua ; after passing through the northern Lesser Antilles , it turned to the north and intensified into a Category 5 hurricane .
Simplified: Dog began on August 30 to the east of Antigua . After passing through the northern Lesser Antilles , the storm turned to the north and became a Category 5 hurricane .