Task: Text Simplification
Input (English): convinced that the grounds were haunted , they decided to publish their findings in a book an adventure -lrb- 1911 -rrb- , under the pseudonyms of elizabeth morison and frances lamont.
Output (English): after making sure that the grounds were haunted , they decided to publish their discovery in a book an adventure -lrb- 1911 -rrb- , under the nicknames of elizabeth morison and frances lamont.