Complex sentence: Overproduction differs from underconsumption, in which the excess supply results only from low consumer demand; overproduciton can also arise due to low fixed investment, low net exports, or contractionary fiscal or monetary policy.
Split into simpler sentences: Overproduction differs from underconsumption, in which the excess supply results only from low consumer demand. Overproduction can also arise due to low fixed investment, low net exports, or contractionary fiscal or monetary policy.