Complex sentence: Controlled hunting is important for the welfare of reindeer, the quality of life for Inuit, and the preservation of tundra grazing areas, and therefore scientific research is regularly performed to determine the quotas needed to maintain a proper ecological balance.
Split into simpler sentences: Controlled hunting is important for the welfare of reindeer, the quality of life for Inuit, and the preservation of tundra grazing areas. Therefore scientific research is regularly performed to determine the quotas needed to maintain a proper ecological balance.