Complex sentence: This is thought to have pierced an underground aquifer, resulting in the release of large amounts of water, causing crustal collapse, which created the Aromatum Chaos depression, and a catastrophic flood event, which formed the Ravi Vallis outflow channel.
Split into simpler sentences: This is thought to have pierced an underground aquifer, resulting in the release of large amounts of water. This caused crustal collapse, which created the Aromatum Chaos depression, and a catastrophic flood event, which formed the Ravi Vallis outflow channel.