Simplify the following text for a Grade 7 native English-speaking person.
Original: Homer and Bart make a racer together , however it is not very good , and Bart decides to drive Martin 's far more superior racer instead , after he is involved in an accident where he receives a series of serious skin burns .
Simplified: Homer and Bart make a racer together , however it is not very good , and Bart decides to drive Martin 's much nicer racer instead .