What is {employer} of {Gus Grissom} that is {position held} is {astronaut} ?
Astronaut Gus Grissom was employed by whom?
Who employs the astronaut Gus Grissom?
SELECT ?w WHERE { ?k property:position_held resource:astronaut . resource:Gus_Grissom property:employer ?k . ?k property:employer ?w }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q110879> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P108> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P39> <http://wikidata.dbpedia.org/resource/Q11631>
} 

SELECT ?obj WHERE { wd:Q110879 p:P108 ?s . ?s ps:P108 ?obj . ?s pq:P39 wd:Q11631 }