Complex sentence: Fresh water is considered to have a density of 1000 kg/m³ and sea water 1025 kg/m³, in inch-pound units densities are 62.4 lb/cu ft for fresh water and 64 lb/cu ft for sea water.
Split into simpler sentences: Fresh water is considered to have a density of 1000 kg/m³ and sea water 1025 kg/m³. English (US) densities are 62.4 lb/cu ft for fresh water and 64 lb/cu ft for sea water.