It's possible that:
* The name is slightly misspelled: There might be a similar name, such as Margaret Sempel, Simple, or Semple- with an additional word.
* The artist is relatively unknown: They might be an emerging artist or work in a specific niche.
* The artist uses a different name: Some artists choose to use pseudonyms or initials.
To help me find information about this artist, please provide more context:
* What kind of art do they create? (painting, sculpture, photography, etc.)
* What is their approximate time period or location?
* Do you have any additional details, such as a website or gallery affiliation?
With more information, I can try to find more about this artist.