Complex sentence: In the letter, Yuki says that maids and servants have been disappearing and she suspects monsters to be the culprit and also request that Samanosuke saves her from the castle before she ends up as one of the victims.
Split into simpler sentences: In the letter, Yuki says that maids and servants have been disappearing and she suspects monsters to be the culprit. She also request that Samanosuke saves her from the castle before she ends up as one of the victims.