Complex sentence: From June 1969 to November 1971, the Battalion was part of 61 Mountain Brigade and was deployed in the counter Insurgency Operation in Mizoram with the Insurgency peaking during the time with their relentless effort and being widely dispersed they brought normalcy in the area of responsibility.
Split into simpler sentences: From June 1969 to November 1971, the Battalion was part of the 61st Mountain Brigade and was deployed in the Counter Insurgency Operation in Mizoram, with the Insurgency peaking during that time. With their relentless effort and despite being widely dispersed they brought normalcy to the area of responsibility.