Complex sentence: The failure then, according to Daniels, was that the Soviet economy was not able to deliver in certain sectors; for instance, throughout Soviet history, deficiencies in agriculture and consumer goods always existed.
Split into simpler sentences: The failure then, according to Daniels, was that the Soviet economy was not able to deliver in certain sectors; agriculture is a sector where this failure occured. Throughout Soviet history, deficiencies in agriculture and consumer goods always existed.