Complex sentence: Armco Steel closed the plant because they did not want to replace the obsolete Open Hearth Furnaces with the more efficient basic oxygen steel furnaces and the plant needed a continuous caster to replace the obsolete soaking pits and blooming mill in 1995.
Split into simpler sentences: Armco Steel closed the plant because they did not want to replace the obsolete Open Hearth Furnaces with the more efficient basic oxygen steel furnaces. The plant also needed a continuous caster to replace the obsolete soaking pits and blooming mill in 1995.