Simplify the following text for a Grade 6 native English-speaking person.
Original: Kubica was in 3rd place in the opening round , when he collided with Vettel while battling for 2nd place and was forced to retire .
Simplified: Kubica was in 3rd place in the opening round , when he collided with Vettel while battling for 2nd place . Kubica was forced to retire from the race .