Simplify the following text for a Grade 6 native English-speaking person.
Original: The novelist Matteo Bandello observed Leonardo at work and wrote that some days he would paint from dawn till dusk without stopping to eat , and then not paint for three or four days at a time .
Simplified: The novelist Matteo Bandello saw Leonardo at work . Bandello wrote that on some days he would paint from morning till night without stopping to eat .