Complex sentence: Mount Yasur is an active volcano on Tanna Island, Vanuatu, high above sea level, on the coast near Sulphur Bay, southeast of the taller Mount Tukosmera, which was active in the Pleistocene.
Split into simpler sentences: Mount Yasur is an active volcano on Tanna Island, Vanuatu with a height of above sea level, located on the coast near Sulphur Bay. It lies to the southeast of the taller Mount Tukosmera, which was active in the Pleistocene.