Complex sentence: The child was left pinned under the vehicle which had jumped onto the sidewalk of President Street and Utica Avenue because the police ordered the ambulance away, fearing the outrage that was being expressed by black bystanders.
Split into simpler sentences: The child was left pinned under the vehicle which had jumped onto the sidewalk of President Street and Utica Avenue. The police ordered the ambulance away, fearing the outrage that was being expressed by black bystanders.