Complex sentence: Her armour and underwater protection were equal to her contemporaries, except the Japanese "Yamato" class battleships but she was limited by a weak anti-aircraft artillery suite and optical-only fire control.
Split into simpler sentences: Her armour and underwater protection were equal to her contemporaries, except the Japanese "Yamato" class battleships. She was nearly complete, but limited by a weak anti-aircraft artillery suite and optical-only fire control.