Simplify the following text for a Grade 6 native English-speaking person.
Original: She died , with her sons Giovanni and Garzia , in 1562 , when she was only forty ; all three of them were struck down by malaria while traveling to Pisa .
Simplified: She died , with her sons Giovanni and Garzia , in 1562 , aged forty . All three of them died from malaria while traveling to Pisa .