Complex sentence: Of the 19 men who had sailed in the launch, only 12 would reach England--apart from Norton and Nelson, Elphinstone, Linkletter and Hall died in Batavia, and Lamb died on a Dutch East India Company ship.
Split into simpler sentences: Of the 19 men who had sailed in the launch, only 12 would reach England. Besides Norton and Nelson, Elphinstone, Linkletter and Hall all died in Batavia, and Lamb died on a Dutch East India Company ship.