Complex sentence: With increasing population, lack of arable land and few irrigation options, despite forest supplements, malnutrition has been an historic problem for the Chepang who have often been characterized as the poorest of Nepal's poor.
Split into simpler sentences: With increasing populations, lack of arable land and few irrigation options, malnutrition has been a historic problem for the Chepang despite forest supplements. The Chepang have often been characterized as the poorest of Nepal's poor.