Complex sentence: From August 1961 to February 1963, he served as a pilot trainee in both the 3526th Student Squadron, Williams Air Force Base in Arizona and Tinker Air Force Base, Oklahoma, being promoted to the rank of First Lieutenant on December 7,1962.
Split into simpler sentences: From August 1961 to February 1963, he served as a pilot trainee in both the 3526th Student Squadron, Williams Air Force Base in Arizona and Tinker Air Force Base, Oklahoma. He was promoted to the rank of First Lieutenant on December 7,1962.