Simplify the following text for a Grade 5 native English-speaking person.
Original: In 2004 , in the wake of several crashes including the fatal crash of Tony Renna and the severe crash of Kenny BrÃ ck , the displacement was further reduced to 3.0 L to curb top speeds .
Simplified: In 2004 , the displacement was further reduced to 3.0 L to curb top speeds .