Simplify the following text for a Grade 13 native English-speaking person.
Original: A mid - to lower-level circulation developed within the system as it tracked generally north-northwestward , and based on surface and satellite observations , it is estimated the system developed into Tropical Depression Seven at 1200 UTC on July 25 about 60 miles ( 95 km ) east of Daytona Beach , Florida .
Simplified: According to surface and satellite observations , it is thought that the system became Tropical Depression Seven at 1200 UTC on July 25 about 60 miles ( 95 km ) east of Daytona Beach , Florida .