Simplify the following text for a Grade 7 native English-speaking person.
Original: Giotto 's contemporary Giovanni Villani wrote that Giotto was `` the most sovereign master of painting in his time , who drew all his figures and their postures according to nature .
Simplified: Giovanni Villani , who lived at the same time as Giotto , wrote that he was the king of painters , who drew all his figures as if they were alive .