Complex sentence: After days of drifting under the relentless sun, surviving only on coconut pulp, they made landfall at the mainland, but Sylvain abandoned his coconut sack prematurely and was devoured by quicksand.
Split into simpler sentences: After days of drifting on the ocean under the relentless sun, surviving only on coconut pulp, they arrived at the mainland. However, the other prisoner left his coconut sack prematurely and was devoured by quicksand.