Simplify the following text for a Grade 9 native English-speaking person.
Original: This was due to the large size of Florence ; the overall wind field reached a diameter of 460 miles ( 745 km ) , and the radius of maximum winds reached about 110 miles ( 170 km ) .
Simplified: This is because of the large size of Florence ; the wind field reached 460 miles ( 745 km ) wide with a radius of maximum winds of about 110 miles ( 170 km ) .