Complex sentence: As his step-uncle was Anglo-American, the young Chee quickly became fluent in English and eventually replaced Jesus Arviso as the official Navajo interpreter to the U.S. military.
Split into simpler sentences: As his step-uncle was Anglo-American, the young Chee quickly became fluent in English. Chee Dodge eventually replaced Jesus Arviso as the official Navajo interpreter to the U.S. military.