question: Which film editor was a German American editor of M2 and M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.editor.film M3 .
  ?x0 ns:people.person.nationality ns:m.0345h .
  ?x0 ns:people.person.nationality ns:m.09c7w0
  }