Was a film director employed by M2 and employed by M3 a film editor
SELECT count(*) WHERE {
?x0 a ns:film.director .
?x0 a ns:film.editor .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3
}