Was M1 a German art director that M4 was produced by and a film was edited by
SELECT count(*) WHERE {
?x0 a ns:film.film .
M1 a ns:film.film_art_director .
M1 ns:film.editor.film ?x0 .
M1 ns:film.producer.film|ns:film.production_company.films M4 .
M1 ns:people.person.nationality ns:m.0345h
}