what is the {start time} for {Bobby Moore} has {member of sports team} as {Seattle Sounders} ?
Tell me when Bobby Moore became a Seattle Sounder.
When did Bobby Moore join the Seattle Sounders?
SELECT ?l WHERE { resource:Bobby_Moore property:member_of_sports_team ?i . ?i property:member_of_sports_team resource:Seattle_Sounders . ?i property:start_time ?l }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q191492> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P54> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q956200> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q191492 p:P54 ?s . ?s ps:P54 wd:Q956200 . ?s pq:P580 ?value}