Complex sentence: After 28 failed attempts, Liapidevski located the ice camp on March 5, landed and hauled out twelve of 104 survivors, however, on the second flight a week later he crash-landed the airplane after an engine failure.
Split into simpler sentences: After 28 failed attempts, Liapidevski located the ice camp on March 5, landed and hauled out twelve of 104 survivors. A week later, on the second flight to ice camp, he crash-landed the airplane after an engine failure.