question: Who was a German film editor that edited a film and directed M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.editor .
  ?x0 a ns:people.person .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.editor.film ?x1 .
  ?x0 ns:people.person.nationality ns:m.0345h .
  ?x1 a ns:film.film
  }