Complex sentence: In 1923 the land that is now the Allegheny National Forest was purchased by the Federal Government, but the federal government did not buy the subsurface or mineral rights of the land because of financial issues.
Split into simpler sentences: In 1923 the land that is now the Allegheny National Forest was purchased by the Federal Government. The federal government did not buy the subsurface or mineral rights of the land because of financial issues.