Complex sentence: Material distribution applications use ball casters, attached to a table in an inverted array, so that the exposed rotating surfaces of the balls are oriented upwards, allowing boxes and other flat-bottomed objects to be pushed atop the casters in any direction desired.
Split into simpler sentences: Material distribution applications use ball casters, attached to a table in an inverted array. The exposed rotating surfaces of the balls are oriented upwards, so boxes and other flat-bottomed objects can be pushed atop the casters in any direction desired.