Complex sentence: At age 17 in 1962, he joined the Nigeria Police Force (NPF) for cadet training but had to wait a whole year before this could begin, he completed his training in 1965 with the rank of an Assistant Superintendent of Police (ASP).
Split into simpler sentences: At age 17 in 1962, he joined the Nigeria Police Force (NPF) for cadet training, but had to wait a year before this could begin. In 1965, he completed his training with the rank of an Assistant Superintendent of Police (ASP).