Simplify the following text for a Grade 12 native English-speaking person.
Original: Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of waveâ `` particle duality .
Simplified: The photoelectric effect has helped physicists understand the quantum nature of light and electrons . The concept of waveâ `` particle duality was developed because of the photoelectric effect .