Was a Mexican German person that influenced a person M1
SELECT count(*) WHERE {
?x0 a ns:people.person .
M1 a ns:people.person .
M1 ns:influence.influence_node.influenced ?x0 .
M1 ns:people.person.nationality ns:m.0345h .
M1 ns:people.person.nationality ns:m.0b90_r
}