Simplify the following text for a Grade 6 native English-speaking person.
Original: However , a post-storm analysis concluded that Grace had actually become a tropical storm 12 hours earlier than initially estimated , placing its location of development further south , at 38.5 Â N. The storm still marked the farthest northeast a tropical cyclone formed in the Atlantic basin , breaking the record set by Hurricane Vince in 2005 .
Simplified: However , at the end of hurricane season , it was found that Grace actually became a tropical storm 12 hours earlier than people first thought . As a result , it formed at 38.5 Â N , which is further south .