Complex sentence: The school has an Independent Company of Junior and Senior Division N.C.C. as an integral part, including all the three divisions of the defence services: the Army, Navy and Air Force.
Split into simpler sentences: The School has an Independent Company of Junior and Senior Division N.C.C. as integral part. N.C.C. unit of school comprises all the three wings of defence services i.e. the Army, Navy and Air Force.