Simplify the following text for a Grade 10 native English-speaking person.
Original: Since the early 1980s the FIA have required that Formula One entrants own the intellectual rights to the chassis that they enter , and so the terms `` entrant '' and `` constructor '' , and hence also `` team '' , have become synonymous .
Simplified: Since the early 1980s , the FIA requires that Formula One entrants own the intellectual rights to the chassis that they enter .