Complex sentence: It has been estimated that nearly 70,000 people have died due to terrorism in Peru that started in 1980, an ongoing conflict which is considered to have wound down by 2000 and violence erupted in 2014 between the Peruvian Army and guerrilla fighters in Peru proper.
Split into simpler sentences: It has been estimated that nearly 70,000 people have died due to terrorism in Peru, in violence that started in 1980, in an ongoing conflict which is considered to have wound down by 2000. However, violence erupted in 2014 between the Peruvian Army and guerrilla fighters in Peru proper.