question: Was M1 's sequel 's art director a company 's employee
query: SELECT count(*) WHERE {
  ?x0 ns:film.film_art_director.films_art_directed ?x1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x2 .
  ?x1 ns:film.film.prequel M1 .
  ?x2 a ns:business.employer
  }