Simplify the following text for a Grade 5 native English-speaking person.
Original: The present design of the track dates back from 1990 , when the original circuit was shortened from 7,829 m to only 4,397 m ( so that it could fit the new FIA restrictions on track length ) .
Simplified: The present design of the track dates back to 1990 . The FIA had placed new restrictions on track length .