Is that grammatically correct? I mean, I assume the complete sentence is: I went to work filling a book order and I was annoyed that Valencia took such great pleasure in pretending to be poor.
As long as I know, it can be rewritten: I went to work filling a book order, being annoyed that Valencia took such great pleasure in preten
Is that grammatically correct? -- Yes, if course. Otherwise, I would have corrected it.
I mean, I assume the complete sentence is: I went to work filling a book order and I was annoyed that Valencia took such great pleasure in pretending to be poor.-- There is no 'complete' sentence there; yours is another way of expressing the same thing, though.