Complex sentence: However, concerns have been raised over the sustainability of intensive agriculture, with decreased soil quality in India and Asia, and concern over the effects of fertilizers and pesticides on the environment, particularly as population increases and food demand expands.
Split into simpler sentences: However, concerns have been raised over the sustainability of intensive agriculture. Intensive agriculture has become associated with decreased soil quality in India and Asia, and there has been increased concern over the effects of fertilizers and pesticides on the environment, particularly as population increases and food demand expands.