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: [['Atherton', 'LEFT', '1976'], ['[TABLECONTEXT]', '[TITLE]', 'Genesee County B League'], ['[TABLECONTEXT]', 'HIGH_SCHOOL', 'Atherton'], ['1976', 'LEAGUE_LEFT_TO', 'Mid-Eastern Eight Conference']]

Atherton High School left the Genesee County B League in 1976 to join the Mid-Eastern Eight Conference.