what is the {start time} for {David Brown} has {member of sports team} as {Warrington Wolves} ?
During what time period did David Brown play for the Washington Wolves?
When was David Brown a member of the Warrington Wolves?
SELECT ?b WHERE { ?r property:member_of_sports_team resource:Warrington_Wolves . resource:David_Brown property:member_of_sports_team ?r . ?r property:start_time ?b }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q3017134> .
?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/Q2549837> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q3017134 p:P54 ?s . ?s ps:P54 wd:Q2549837 . ?s pq:P580 ?value}