Complex sentence: According to these the western, eastern and southern flanks could be threatened by lava flows, whereas the older volcanoes protect much of the northern flank, while hazards from pyroclastic flows extend farther, down to the Laguna Aricota southwest of the volcano.
Split into simpler sentences: According to these the western, eastern and southern flanks could be threatened by lava flows, whereas the older volcanoes protect much of the northern flank. Hazards from pyroclastic flows extend farther, down to the Laguna Aricota southwest of the volcano.