Complex sentence: Exchanging ILs for efficient CFLs on a global scale would achieve annual reductions of 230 Mt (million tons), more than the combined yearly emissions of the Netherlands and Portugal.
Split into simpler sentences: Exchanging ILs for efficient CFLs on a global scale would achieve annual reductions of 230 Mt (million tons). By way of comparison, this is greater than then combined yearly emissions of the Netherlands and Portugal.