Complex sentence: According to Indian military sources, apparently independently of the political leadership, the Pakistani Army is said to have prepared a plan called Operation Gulmarg and put it into action as early as 20 August, a few days after Pakistan's independence.
Split into simpler sentences: According to Indian military sources, the Pakistani Army prepared a plan called Operation Gulmarg apparently independently of the political leadership. It was into action as early as 20 August, a few days after Pakistan's independence.