What German art director and editor of M3 did M1 star and M2 star
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.actor.film/ns:film.performance.film M1 .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
?x0 ns:film.editor.film M3 .
?x0 ns:film.film_art_director.films_art_directed M3 .
?x0 ns:people.person.nationality ns:m.0345h
}