Beatrix Potter bought the tarn in 1929 and bequeathed it to the National Trust.
In 1929, Beatrix Potter expressed an interest in buying the tarn, but could not do so because she could not afford to. 
mnli hypothesis: In 1929, Beatrix Potter expressed an interest in buying the tarn, but could not do so because she could not afford to.  premise: Beatrix Potter bought the tarn in 1929 and bequeathed it to the National Trust.