Simplify the following text for a Grade 11 native English-speaking person.
Original: In Rome 's Piazza Navona , a famous sculpture , Fontana dei Quattro Fiumi ( fountain of the four rivers ) designed by Gian Lorenzo Bernini was built in 1651 .
Simplified: In Rome 's Piazza Navona , Fontana dei Quattro Fiumi ( fountain of the four rivers ) was designed by Gian Lorenzo Bernini and built in 1651 .