What art director was employed by M1 's employer and employed by a film producer
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film_art_director .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
?x2 a ns:film.producer
}