Complex sentence: As both cars reach the finish line, Natasha (driving Michael's Enzo Ferrari) is several car lengths ahead of Brecken's Saleen S7 Twin Turbo when she receives a phone call from Carlo notifying her that he has rescued her mother.
Split into simpler sentences: As both cars reach the finish line, Natasha (driving Michael's Enzo Ferrari) is several car lengths ahead of Brecken's Saleen S7. Shortly before reaching the finish line, Natasha receives a phone call from Carlo notifying her that he has rescued her mother.