Sarah,
May I most respectfully suggest that your sentence needs revision.
There are at least three bits of information that we need:
1. Is "Collectors" the name of a magazine?
2, What does "which was awarded by the magazine" refer to? (What was awarded?)
3. It would make for a better sentence if you told us the name of the artist.
If you give us this information, then someone can help you write a clearer sentence.