Complex sentence: On 6 October 2013, he was involved in a serious crash at the Grand Prix of Houston, when his car flew into catch-fencing after contact with the car of Takuma Sato.
Split into simpler sentences: On 6 October 2013, he was involved in a serious crash at the Grand Prix of Houston. His car flew into catch-fencing after contact with the car of Takuma Sato.