Original: The last descendant of the original princes, RenÃ of Nassau, left the principality to his cousin William the Silent, who was not a descendant of the original Orange family but the legal heir to the principality of Orange.
Simplified: The last of the original princes, RenÃ of Nassau, left the principality to his cousin William the Silent after he died. William the Silent was not related to the original house of Orange, but was the legal heir.