Complex sentence: They can be as simple as a series resistor or inductor, capacitors, or a combination thereof or as complex as electronic ballasts used with fluorescent lamps and high-intensity discharge lamps.
Split into simpler sentences: They can be as simple as a series resistor or inductor, or a capacitor, or a combination these. They may be as complex as the electronic ballasts used in fluorescent lamps and high-intensity discharge lamps.