question: Who was influenced by M1 , M2 , and M3 and influenced by a American German person
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:influence.influence_node.influenced_by ?x1 .
  ?x0 ns:influence.influence_node.influenced_by M1 .
  ?x0 ns:influence.influence_node.influenced_by M2 .
  ?x0 ns:influence.influence_node.influenced_by M3 .
  ?x1 a ns:people.person .
  ?x1 ns:people.person.nationality ns:m.0345h .
  ?x1 ns:people.person.nationality ns:m.09c7w0
  }