 The débâcle of the Afghan civil war left a vacuum in the Hindu Kush area that concerned the British, who were well aware of the many times in history it had been employed as the invasion route to South Asia.
<fluency>  The débâcle of the Afghan civil war left a vacuum in the Hindu Kush area that concerned the British, who were well aware of the many times in history it had been employed as the invasion route to South Asia.
 The débâcle of the Afghan civil war left a vacuum in the Hindu Kush area that concerned the British, who were well aware of the many times in history it had been employed as an invasion route to South Asia.