Long modifier subject confusion(expert help required)

i will admit that i am totally lost with all the subject1's and verb2's and so forth -- maybe you can use some parentheses to make things clearer? -- so i will just show you how the originally correct sentence works:

arghya05 wrote:In June of 1987, The Bridge of Trinquetaille, Vincent van Gogh's view of an iron bridge over the Rhone, was sold for $20.2million, the second highest price ever paid for a painting at auction.

the orange part is a modifier. (it's called an "appositive", but the important part is that it's a modifier.)
modifiers can be removed in grammatical analysis, so you can just look at the remaining part -- The Bridge of Trinq was sold...

the key is just to be able to recognize which parts of a sentence are modifiers.
punctuation and so on can help you here, but the meaning of the sentence makes this job much easier!
if you understand the meaning of the sentence, then you know that “vincent van gogh's view of an iron bridge over the rhone" is a modifier describing the painting; the fact that it is enclosed between two commas should reinforce this conclusion.

i honestly don't think that all this subject1 subject2 verb1 verb2 stuff is going to help you -- there's *way* too much possible variety in english sentences to approach them with this sort of algorithmic technique.
instead, this approach tells me that you aren't paying nearly enough attention to the meaning of the sentence!