Complex sentence: Acroloxidae, commonly known as river limpets, are a taxonomic family of very small, air-breathing, freshwater molluscs, aquatic pulmonate gastropod limpet-like mollusks with a simple flattened conical shell.
Split into simpler sentences: Acroloxidae, commonly known as river limpets, are a taxonomic family of very small, air-breathing, freshwater limpets. In other words they are aquatic pulmonate gastropod mollusks with a simple flattened conical shell.