When is end time and start time of Guglielmo Marconi whose spouse as Beatrice O'Brien?
SELECT ?value1 ?value2 WHERE { wd:Q36488 p:P26 ?s . ?s ps:P26 wd:Q22230905 . ?s pq:P582 ?value1 . ?s pq:P580 ?value2 }
guglielmo marconi: Q36488 : Q22230905