Complex sentence: North India was devastated by a cold wave during the m January 2017, affecting several North Indian states, including Himachal Pradesh, Jammu and Kashmir, Punjab, Harayana, Rajasthan, and Uttar Pradesh.
Split into simpler sentences: North India was devastated by a cold wave during the month of January 2017. This occurence took a severe effect on several North Indian states, including Himachal Pradesh, Jammu and Kashmir, Punjab, Harayana, Rajasthan, and Uttar Pradesh.