My apologies for the double post, but as far as breaking down and argument's structure, the grammar lessons in 7Sage's core curriculum are very helpful.
Here is a link:
https://7sage.com/lesson/grammar-subject-predicate-details/
I had almost an identical experience as everyone on this thread. I am going to be honest, I really needed this thread right now because I've been distraught all afternoon. I guess we double down and try again.