Complex sentence: These accusations have been seen by the international community as baseless excuses since the only connection Gaza has with the outside world is the tunnels that connect it with Egypt which it uses to import much needed medicine, food, and materials.
Split into simpler sentences: These accusations have been seen by some in the international community as baseless excuses since the only connection Gaza has with the outside world is the tunnels that connect it with Egypt. The tunnels are used to import much needed medicine, food, and materials.