Complex sentence: On the eighth day, the fittest began throwing the weak and wounded overboard until only fifteen men remained, all of whom survived until their rescue on 17 July by "Argus", which had accidentally encountered them.
Split into simpler sentences: On the eighth day, the fittest began throwing the weak and wounded overboard until only fifteen men remained. All fifteen survived until their rescue on 17 July by "Argus" which had accidentally encountered them.