Simplify the following text for a Grade 8 native English-speaking person.
Original: The names of all four satellites of Uranus then known were suggested by John Herschel in 1852 at the request of Lassell .
Simplified: The name `` Umbriel '' and the names of all four moons of Uranus then known were suggested by John Herschel in 1852 at the request of Lassell .