Complex sentence: Including Danilo, 71 of the 77 occupants died as a result of the crash; the number of dead was initially thought to be 75 but it was later revealed that 4 people had not boarded the aircraft.
Split into simpler sentences: Including Danilo, 71 of the 77 occupants died as a result of the crash. The number of dead was initially thought to be 75 but it was later revealed that 4 people had not boarded the aircraft.