Complex sentence: Lord Carnarvon, who was part of the group that discovered Tutankhamun's tomb, died soon after it was discovered in a shaving accident from likely cutting an infected mosquito bite, which fuelled the story that there was a curse on the tomb.
Split into simpler sentences: Lord Carnarvon, part of the group that found Tutankhamun's tomb, died soon after it was discovered in a shaving accident, likely from cutting an infected mosquito bite. His death fuelled the story that there was a curse on the tomb.