Complex sentence: In the meantime the volcano grows increasingly violent, and when the 27th arrives Tjakra Amidjaja and Sadidjah stay behind to manage the evacuation, sending only their children, Hasan and Soerijati, to stay with family in Rangkas Gombong.
Split into simpler sentences: In the meantime the volcano grows increasingly violent, and Tjakra Amidjaja and Sadidjah stay behind to manage the evacuation. They send their children, Hasan and Soerijati, to stay with family in Rangkas Gombong.