Complex sentence: Half of the 25 million cords (90,615,000 m 3) of balsam fir standing in 1931 were estimated to have died or been injured beyond recovery, while millions of cords of white spruce were also probably killed.
Split into simpler sentences: Half of the 25 million cords (90,615,000 m 3) of balsam fir standing in 1931 were estimated to have died or been injured beyond recovery. Millions of cords of white spruce were also probably killed.