Was a executive producer of a sequel of M2 M1 's German producer
SELECT count(*) WHERE {
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x0 ns:people.person.nationality ns:m.0345h .
?x1 ns:film.film.prequel M2
}