Simplify the following text for a Grade 5 native English-speaking person.
Original: In 2006 , he drove at the highest level in the Formula Renault hierarchy , the Formula Renault 3.5 Series , for Tech 1 Racing , but left the series after four rounds having not scored any points .
Simplified: In 2006 , he drove in the Formula Renault 3.5 Series , for Tech 1 Racing . He left the series after four rounds and zero points .