Simplify the following text for a Grade 12 native English-speaking person.
Original: Responding to the drivers ' feedback , FIA race director and safety delegate Charlie Whiting ordered the high kerbs at Singapore 's turn 10 hairpin be modified ahead of Friday 's free practice .
Simplified: Responding to the drivers ' feedback , FIA race director and safety delegate Charlie Whiting ordered the high kerbs at Singapore 's turn 10 hairpin be modified .