Complex sentence: The agglomerates of aluminum hydroxide are calcined where they are roasted at temperatures of up to 1100 ° C to drive off free moisture and chemically-connected water, producing alumina solids at temperatures in excess of 960 ° C (1750 ° F).
Split into simpler sentences: The agglomerates of aluminum hydroxide are calcined at temperatures of up to 1100 ° C to drive off free moisture and chemically-connected water. This process produces alumina solids at temperatures in excess of 960 ° C (1750 ° F).