Complex sentence: In 1958, Heins survived a crash during the Sports Car version of the Belgian Grand Prix when his car hit a stack of hay bales before becoming airborne and sliding on its top with his upper body exposed.
Split into simpler sentences: In 1958, Heins survived a crash during the Sports Car version of the Belgian Grand Prix. His car hit a stack of hay bales, became airborne, flipped and slid with his upper body exposed.