Was M1 a German producer and art director of a prequel of M0
SELECT count(*) WHERE {
?x0 ns:film.film.sequel M0 .
M1 ns:film.film_art_director.films_art_directed ?x0 .
M1 ns:film.producer.film|ns:film.production_company.films ?x0 .
M1 ns:people.person.nationality ns:m.0345h
}