What was a film whose sequel starred a director of M1 and M2
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.sequel ?x1 .
?x1 ns:film.film.starring/ns:film.performance.actor ?x2 .
?x2 ns:film.director.film M1 .
?x2 ns:film.director.film M2
}