Simplify the following text for a Grade 7 native English-speaking person.
Original: The lack of development was reflected with a drop of form throughout the second half of the season , causing BMW to be outpaced by Renault , Toyota and even Toro Rosso ( who started the season as one of the slowest teams ) by the end of the season .
Simplified: The lack of development was showed with a drop in performance through the second half of the season . BMW was outpaced by Renault , Toyota and Toro Rosso