Complex sentence: Ryan and Walker ran past the fallen warder and commandeered a blue Standard Vanguard sedan on Sydney Rd driven by Brian Mullins, with Walker driving the car through an adjacent service station and away, west along O'Hea Street.
Split into simpler sentences: Ryan and Walker ran past the fallen warder and commandeered a blue Standard Vanguard sedan on Sydney Rd from its driver, Brian Mullins. With Walker then driving, the car travelled through an adjacent service station and away, west along O'Hea Street.