Simplify the following text for a Grade 8 native English-speaking person.
Original: Ferdinando was the fifth son of Cosimo I de ' Medici , Grand Duke of Tuscany and Eleonora di Toledo , the daughter of Don Pedro Alvarez de Toledo , the Spanish viceroy of Naples .
Simplified: Ferdinando was the fifth son of Cosimo I de ' Medici , Grand Duke of Tuscany and Eleonora di Toledo .