Complex sentence: Gas flaring is generally discouraged and condemned by the international community, as it contributes greatly to climate change, which ironically can display its most devastating effects in developing countries like Nigeria, and particularly in the semi-arid Sahel regions of sub-Saharan Africa.
Split into simpler sentences: Gas flaring is generally discouraged and condemned by the international community, as it contributes greatly to climate change. Which ironically can display its most devastating effects in developing countries like Nigeria, and particularly in the semi-arid Sahel regions of sub-Saharan Africa.