What is {member of sports team} of {John Charles} that is {start time} is {1950-1-1} ?
Give me the name of the member of sports team of John Charles who started at 1950-1-1?
Who is the member of sports team of John Charles who started at 1950-1-1?
SELECT ?h WHERE { FILTER ( CONTAINS ( YEAR ( ?h ) , '1950' ) ) . ?y property:start_time ?h . ?y property:member_of_sports_team ?h . resource:John_Charles property:member_of_sports_team ?y }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q312404> .
?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> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1950-1-1>
} 

SELECT ?obj WHERE { wd:Q312404 p:P54 ?s . ?s ps:P54 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1950')) }