Was a person that M1 was produced by and was edited by M2 's director and star
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.film M2 .
?x0 ns:film.director.film M2 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.producer.film|ns:film.production_company.films M1
}