Complex sentence: This International Boundary line of Afghanistan and Pakistan, the Durand Line, is named after Sir Mortimer Durand and remains the international boundary between Afghanistan and modern-day Pakistan, officially recognised by most nations but is an ongoing point of contention between the two countries.
Split into simpler sentences: This international boundary line of Afghanistan and Pakistan, the Durand Line, is named after Mortimer Durand, and remains the international boundary between Afghanistan and modern-day Pakistan, officially recognised by most nations. However, it is an ongoing point of contention between the two countries.