Complex sentence: They try to camp for the night but lose their tent and must trek onwards, unable to sleep lest they freeze, arriving within sight of the Buddhist monastery of Khor-Biyong before being caught in an avalanche.
Split into simpler sentences: They try to camp for the night but lose their tent and must trek onwards, unable to sleep lest they freeze. They arrive within sight of the Buddhist monastery of Khor-Biyong before being caught in an avalanche.