Simplify the following text for a Grade 5 native English-speaking person.
Original: In preparation for his impending NASCAR career , Speed entered into the Automobile Racing Club of America ( ARCA ) series in selected races in 2007 , and a full season in 2008 .
Simplified: To get ready for racing in NASCAR , Speed raced in the Automobile Racing Club of America ( ARCA ) series . he enter several races in 2007 , and a full season in 2008 .