Complex sentence: On December 12,1942, it too crashed after the pilot allowed a passenger to take his seat momentarily and the passenger apparently disengaged the automatic pilot, sending the ship into a nosedive from an altitude of 500m (1,500ft) and killing all 36 on board.
Split into simpler sentences: On December 12,1942, it too crashed after the pilot allowed a passenger to take his seat momentarily. The passenger apparently disengaged the automatic pilot, sending the ship into a nosedive from an altitude of 500m (1,500ft) and killing all 36 on board.