Simplify the following text for a Grade 8 native English-speaking person.
Original: The Soviet Union produced a quantity of social science fiction , including works by the Strugatsky brothers , Kir Bulychov , Yevgeny Zamyatin and Ivan Yefremov .
Simplified: The Soviet Union produced social science fiction too . Some examples are Strugatsky brothers , Kir Bulychov and Ivan Yefremov .