Simplify the following text for a Grade 8 native English-speaking person.
Original: Convective banding became better organized , and late on September 12 it developed into Tropical Depression Ten while located about 350 m south-southwest of Manzanillo , Colima .
Simplified: Late on September 12 , it formed into Tropical Depression Ten . At this time , the storm was about 350 m south-southwest of Manzanillo , Colima .