Complex sentence: Metaperiodates are typically prepared by the dehydration of sodium hydrogen periodate with nitric acid, or by dehydrating orthoperiodic acid by heating it to 100 ° C under vacuum.
Split into simpler sentences: Metaperiodates are typically prepared by the dehydration of sodium hydrogen periodate with nitric acid. Or by dehydrating orthoperiodic acid by heating it to 100 ° C under vacuum.