Complex sentence: The type, and only known species for this genus, "Tzaganosuchus infansis", was discovered on a joint paleontological expedition between the Soviet Union and Mongolia, which described several other crocodiles including many species of "Shamosuchus" and the archosaur genus "Irenosaurus".
Split into simpler sentences: The type, and only known species for this genus, "Tzaganosuchus infansis", was discovered on a joint paleontological expedition between the Soviet Union and Mongolia. That same expedition also described several other reptiles including many species of "Shamosuchus" and the archosaur genus "Irenosaurus".