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: [['United States', 'ETHNIC_GROUP', 'African Americans'], ['United States', 'LEADER_NAME', 'Barack Obama'], ['A Wizard of Mars', 'LANGUAGE', 'English language'], ['A Wizard of Mars', 'COUNTRY', 'United States']]

A Wizard of Mars was written in English and published in the United States. The United States is led by Barack Obama and has African Americans as one of its ethnic groups.