Sentence:  Evegeni Dubovskoi conducted an exceptionally large orchestra , one containing excellent soloists - the violin solos by the concertmaster , Guy Lumia , were especially fine - but one in which the core of traveling players and the body of men added locally had not had time to <WSD>achieve</WSD> much unity . 
Meaning of the word marked with <WSD> tags:  to gain with effort