what is the {start time} for {Sheikh Mujibur Rahman} has {position held} as {president of Bangladesh} ?
Sheikh Mujibur Rahman became president of Bangaldesh in which year?
When did Sheikh Mujibur Rahman become president of Bangladesh?
SELECT ?l WHERE { ?o property:start_time ?l . ?o property:position_held resource:President_of_Bangladesh . resource:Sheikh_Mujibur_Rahman property:position_held ?o }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q191375> .
?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> <http://wikidata.dbpedia.org/resource/Q596123> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q191375 p:P39 ?s . ?s ps:P39 wd:Q596123 . ?s pq:P580 ?value}