Simplify the following text for a Grade 6 native English-speaking person.
Original: Orange County is a county located in the U.S. state of Florida , and was formed in 1824 when it was originally called Mosquito County .
Simplified: In 1824 , the area to the south of St. Johns County became Mosquito County , and Enterprise was named the County Seat . This massive county took up much of Central Florida .