sentence: Since I was twelve , I had an intense desire to learn Spanish , and because of these circumstances that I mentioned before , I had no choice but to wait until I was twenty years old to even begin to learn this language .
modified: Since I was twelve , I had an intense desire to learn Spanish , and because of these circumstances , that I mentioned before , I had no choice but to wait until I was twenty years old to even begin to learn this language .
transformation: PUNCT