Complex sentence: Most damaging, witnesses saw Downs's car being driven very slowly toward the hospital at an estimated speed of five to seven mph, contradicting Downs' claim that she drove to the hospital at a high speed after the shooting.
Split into simpler sentences: Most damaging, witnesses saw Downs's car being driven very slowly toward the hospital at an estimated speed of five to seven mph. Downs claimed that she drove to the hospital at a high speed after the shooting.