Complex sentence: Over almost three decades of work, Tethys has generated one of the largest datasets on Mediterranean cetaceans, and its sighting data are freely available through the OBIS SEAMAP platform (Ocean Biogeographic Information System Spatial Ecological Analysis of Megavertebrate Populations).
Split into simpler sentences: Over almost three decades of work, Tethys has generated one of the largest datasets on Mediterranean cetaceans. Tethys sightings data are shared on the OBIS SEAMAP platform (Ocean Biogeographic Information System Spatial Ecological Analysis of Megavertebrate Populations).