Definition: In this task, you are given triplets. Each triplet is in the form of [subject, predicate, object]. Your task is to generate proper sentence that utilizes these triples. The objective is to construct a sentence that (a) captures the facts specified in the triples and (b) is a well-formed sentence easily understandable by a human. All triple values need not be used directly in the sentence as long as the facts are adequately captured.
Input: [['Apollo 12', 'BACKUP_PILOT', 'Alfred Worden'], ['Alan Bean', 'WAS_A_CREW_MEMBER_OF', 'Apollo 12'], ['Apollo 12', 'OPERATOR', 'NASA'], ['Apollo 12', 'COMMANDER', 'David Scott'], ['Alan Bean', 'WAS_SELECTED_BY_NASA', '1963'], ['Alan Bean', 'DATE_OF_BIRTH', '"1932-03-15"']]

Alan Bean (born on March 15, 1932) was chosen by NASA in 1963 to be crew member of Apollo 12 and Alfred Worden as a backup pilot.The operator of Apollo 12 was NASA under command of David Scott.