Simplify the following text for a Grade 12 native English-speaking person.
Original: Mona Lisa ( also known as La Gioconda or La Joconde ) is a 16th-century portrait painted in oil on a poplar panel by Leonardo di ser Piero da Vinci during the Renaissance in Florence , Italy .
Simplified: Mona Lisa ( also known as La Gioconda or La Joconde ) is a 16th-century portrait painted in oil by Leonardo da Vinci during the Renaissance in Florence , Italy .