Simplify the following text for a Grade 6 native English-speaking person.
Original: The original track was full of fast corners and it allowed cars to keep maximum speed for up to twenty seconds and was considered very dangerous ( though no one ever died there racing Formula One ) but in 1990 the old layout majorly revised .
Simplified: The original track had many fast corners that allowed cars to keep maximum speed for up to twenty seconds . This was considered very dangerous .