Complex sentence: Disadvantages are that circle-throw machine have a large physical dimensions, and may require larger plots to place than other screening units, however as circle--throw screen are predominantly used in heavy-duty separations, large unit sizes are expected.
Split into simpler sentences: Disadvantages are that circle-throw machines have large physical dimensions, and may require larger plots to place than other screening units. However as circle--throw screens are predominantly used in heavy-duty separations, large unit sizes are expected.