Simplify the following text for a Grade 6 native English-speaking person.
Original: At the death of the Prince of Piedmont in 1715 from smallpox Anne Marie died in 1728 after a series of heart attacks .
Simplified: At the death of the Prince of Piedmont in 1715 from smallpox Victor Amadeus II was very upset . His devoted wife Anne Marie died in 1728 after a series of heart attacks .