Complex sentence: Wool producing sheep also need water, and a lot of grazing land in order to survive, thus it is claimed by some that although synthetic fiber production does involve some carbon emissions, the environmental footprint of many fibers is much lower.
Split into simpler sentences: Wool producing sheep also need water and grazing land in order to survive. Thus it is claimed by some that although synthetic fiber production does involve some carbon emissions, the environmental footprint of many fibers is much lower.