Complex sentence: The fence, constructed by India, is well inside Kashmiri territory on the Indian-side to exclude arms smuggling and infiltration by Pakistani-sponsoredterrorists, who wish to bring Kashmir into Pakistan, or gain independence for Kashmir as a whole.
Split into simpler sentences: The fence, constructed by India, is well inside Kashmiri territory on the Indian-side. Its stated purpose is to exclude arms smuggling and infiltration by Pakistani-based separatist militants or terrorists, who wish to bring Kashmir into Pakistan, or gain independence for Kashmir as a whole.