Complex sentence: In Mongolia, the ejecta cloud causes the temperature to climb up to over 200 degrees Celsius, causing the "Charonosaurus" and "Saurornithoides" run inside the cave for shelter.
Split into simpler sentences: In Mongolia, the ejecta cloud causes the temperature to become hotter. As the air temperature starts climbing up to over 200 degrees Celsius, the "Charonosaurus" and "Saurornithoides" run inside the cave for shelter.