Complex sentence: His book on diabetes won him the first prize from the government of Tamil Nadu for the best medical Tamil book, for which he was given a cash reward and citation by the then Chief Minister M. G. Ramachandran.
Split into simpler sentences: His book on Diabetes won him the first prize from Government of Tamil Nadu for the best medicinal Tamil book. He was awarded a cash reward and citation by the then Chief Minister M. G. Ramachandran.