type of sentence and its tree diagram

[sash2008]

please I want to know the type of the following sentence and its tree diagram:

This time I caved in and bought a bar of chocolate, which by that point I convinced
myself could be classified as a 'need' rather than a 'want'.

[susiedqq]

This time I caved in and bought a bar of chocolate, which by that point I convinced myself could be classified as a 'need' rather than a 'want'.

Compound sentence:

I / caved in . . .and . . . .(I)/ bought / bar.


(the remaining huge clause modifies "bar" because it describes what kind of bar.)

[sash2008]

Thank you very much.