[解説] officialese の特徴の1つは1語ですむところで長い語句を使うことである： be of the belief that ... (＝believe that ...) / conduct a study of (＝study) / provide an explanation of (＝explain) / due to the fact that (＝because) / in the event that (＝if) / on the occasion when (＝when).