Simplify the following text for a Grade 10 native English-speaking person.
Original: This left no category below Formula A\/Formula 1 , so Formula Two ( originally known as Formula B ) was first formally codified in 1948 by FIA as a smaller and cheaper complement to the Grand Prix cars of the era .
Simplified: Formula Two ( first known as Formula B ) was first formally defined in 1948 by the FIA as a smaller and cheaper racers to complement to the Grand Prix cars of the era .