Which producer of M1 employed M0 and employed a art director
SELECT DISTINCT ?x0 WHERE {
?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x1 a ns:film.film_art_director
}