had been tinkering
-había estado jugueteando
Past perfect progressiveconjugation oftinker.There are other translations for this conjugation.

tinker

I mentioned at the time I had been tinkering with a Sappho piece since I found out we couldn't use LC.
Yo mencioné en ese momento que había estado pensando una historia con Safo ya que me di cuenta que no podríamos usar LC.
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