Was M3 directed by a art director and directed by a German film editor
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:people.person.nationality ns:m.0345h .
?x1 a ns:film.film_art_director .
M3 ns:film.film.directed_by ?x0 .
M3 ns:film.film.directed_by ?x1
}