Complex sentence: A violent separatist struggle has ensued since the late 1940s making it the longest running separatist struggle in South Asia the main demand is for independence by different ethnic groups and for new states in the Northeast.
Split into simpler sentences: A violent separatist struggle has ensued since the late 1940s making it the longest running separatist struggle in South Asia. The main demand is for independence by different ethnic groups and for new states in the Northeast.