Complex sentence: Mark McCormick is a smart-mouthed, streetwise car thief who is looking at hard time for his latest theft, a prototype sports car, called the Coyote X, designed by his murdered best friend.
Split into simpler sentences: Mark McCormick is a smart-mouthed, streetwise car thief. He faces a long incarceration for his latest theft, a prototype sports car called the Coyote X, designed by his murdered best friend.