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'], ['Alan Bean', 'STATUS', '"Retired"'], ['Alan Bean', 'ALMA_MATER', '"UT Austin, B.S. 1955"']]

Alan Bean, a 1955 graduate from UT Austin (B.S.) was a crew member on the NASA operated Apollo 12 mission (for which Alfred Worden was the backup pilot). Bean is now retired.