Simplify the following text for a Grade 8 native English-speaking person.
Original: Anna Maria Luisa de ' Medici ( 11 August 1667 â `` 18 February 1743 ) was the last scion of the House of Medici .
Simplified: Anna Maria Luisa de ' Medici ( 11 August 1667 â `` 18 February 1743 ) was the last of the House of Medici .