Will a broken timing chain cause bent valve in 4-2198 DOHC engine 2003 Saturn L series sedan?

Yes, a broken timing chain in a 2003 Saturn L series sedan (using the 2.2L 4-2198 DOHC engine) is very likely to cause bent valves. DOHC engines (Double Overhead Cam) are particularly susceptible to this because the valves are directly driven by the camshafts, and a broken timing chain disrupts the precise timing relationship between the pistons and valves. If a piston rises while a valve is open, the valve will be bent.