Simplify the following text for a Grade 7 native English-speaking person.
Original: Halimede , or Neptune IX , like many of the outer satellites of Neptune , is named after one of the Nereids , the fifty daughters of Nereus and Doris .
Simplified: Halimede , or Neptune IX , like many of the farther moons of Neptune , is named after one of the Nereids , the fifty daughters of Nereus and Doris .