What is {position held} of {James Matheson} and {start time}
What function did James Matheson keep and when did it start?
What position did James Matheson hold and when did it start?
SELECT ?v ?y WHERE { ?x property:start_time ?v . . resource:James_Matheson property:position_held ?x . ?x property:position_held ?y }
select distinct ?dataprop1 ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q4870843> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?statement <http://www.wikidata.org/entity/P580> ?dataprop1 . } 
SELECT ?value1 ?obj WHERE { wd:Q4870843 p:P39 ?s . ?s ps:P39 ?obj . ?s pq:P580 ?value1 . }