Original: The Indo-Bangladeshi barrier or Indo-Bangladeshi border fencing is a 4,000-kilometer fence that India is presently constructing to seal off the Indian-Bangladeshi international border in order to prevent illegal immigration and the smuggling of weapons and narcotics .
Simplified: The Indo-Bangladeshi barrier is a 4,000-kilometer fence that India is presently constructing to seal off the Indian-Bangladeshi international border from what was formerly East Bengal .