Complex sentence: Indian Maoists, or Naxals, began their fight against the Indian state after their first uprising, which occurred in a small village called Naxalbari in West Bengal about 40 years ago; the movement's threat to the state has picked up within the last two decades.
Split into simpler sentences: Indian Maoists, or Naxals, began their fight against the Indian state after their first uprising, which occurred in a small village called Naxalbari in West Bengal about 40 years ago. Although, the movement's threat to the state picked up within the last two decades.