Simplify the following text for a Grade 13 native English-speaking person.
Original: For several centuries , it has linked the eastern and western regions of the Indian subcontinent , running from Bangladesh , across north India , into Peshawar in Pakistan up to Kabul , Afghanistan .
Simplified: For several centuries , it has linked the eastern and western regions of the Indian subcontinent , running from Bengal , across north Republic of India , into Peshawar in Pakistan .