Complex sentence: Additionally, four of Nehelenia's henchmen, the Amazoness Quartet, are revealed to actually be Sailor Soldiers destined to become the guardians of Chibiusa, who had been awakened prematurely and corrupted by the dark queen.
Split into simpler sentences: Additionally, four of Nehelenia's henchmen, the Amazoness Quartet, are revealed to actually be Sailor Soldiers destined to become Chibiusa's guardians. They had been awakened prematurely and corrupted by the dark queen.