Simplify the following text for a Grade 6 native English-speaking person.
Original: The film was directed by Steven Spielberg , and based on the novel Schindler 's Ark by Thomas Keneally .
Simplified: Schindler 's List is a 1993 movie set in World War II , and directed by Steven Spielberg . It is based on Schindler 's Ark , a 1982 book by Thomas Keneally .