Was M1 a French screenwriter that edited and wrote M0 's prequel
SELECT count(*) WHERE {
?x0 ns:film.film.sequel M0 .
M1 a ns:film.writer .
M1 ns:film.editor.film ?x0 .
M1 ns:film.writer.film ?x0 .
M1 ns:people.person.nationality ns:m.0f8l9c
}