Complex sentence: Another invertebrate that feeds on the seabed and has swimming abilities is the nautilus, which stores gas in its chambers and adjusts its buoyancy by use of osmosis, pumping water in and out.
Split into simpler sentences: Another invertebrate that feeds on the seabed and has swimming abilities is the nautilus. In its case, it stores gas in its chambers and adjusts its buoyancy by use of osmosis, pumping water in and out.