Was M3 written by a German film editor and edited by a director of M2
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:people.person.nationality ns:m.0345h .
?x1 ns:film.director.film M2 .
M3 ns:film.film.edited_by ?x1 .
M3 ns:film.film.written_by ?x0
}