Simplify the following text for a Grade 5 native English-speaking person.
Original: During Friday Practice , Rubens Barrichello crashed hard into the fence at the Variante Bassa in which he decelerated violently and was knocked unconscious for a few minutes .
Simplified: During the Friday practice , Rubens Barrichello hit the fence at the Variante Bassa . It was a very hard crash and he was knocked unconscious for a few minutes .