Complex sentence: He was the first Bengali Military officer to revolt against Pakistan army on 25th March 1971 liberation war, and was the first officer to be awarded Bir Bikram for his bravery during the Liberation War.
Split into simpler sentences: He was the first Bengali Military officer to revolt against Pakistan army on 25th March 1971. Before the starting of Liberation war, and was the first officer to be awarded Bir Bikram for his bravery during the Liberation War.