Complex sentence: The engines halt at 12:05 and despite the crew's reassurances Lancer panics believing they will be killed at 1:15 unsuccessfully trying to convince the crew that they will soon be under attack, Lanser must suffer the agony of watching the passengers be killed.
Split into simpler sentences: The engines halt at 12:05 and despite the crew's reassurances Lancer panics, believing they will be killed at 1:15. Unsuccessfully trying to convince the crew that they will soon be under attack, Lanser must suffer the agony of watching the passengers be killed.