question: Who was a actor whose employer was founded by and employed M2 , M3 , and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.actor .
  ?x0 a ns:people.person .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
  ?x1 ns:organization.organization.founders M2 .
  ?x1 ns:organization.organization.founders M3 .
  ?x1 ns:organization.organization.founders M4
  }