Simplify the following text for a Grade 6 native English-speaking person.
Original: After having kept the painting in his apartment for two years , Peruggia grew impatient and was finally caught when he attempted to sell it to the directors of the Uffizi Gallery in Florence ; it was exhibited all over Italy and returned to the Louvre in 1913 .
Simplified: After hiding it in his apartment for two years , he grew impatient and tried to sell it to a gallery in Florence , but was caught . It was shown all over Italy before going back to the Louvre .