"Correct" is a hilarious concept when dealing with the English language. Creative writers generally fall back on Strunk & White. S&W agree with b_b, but further argue that the use of a conjunction would make the comma correct: Tech writers revert back to their own style guides (MLA, APA, NSCA, etc) which would all argue that the only appropriate choice would be periods. And then there would be examples of the opposite and then everyone would grumble because no one is reading anyway. Prose writers would do any of the following: - Thanks for the feedback! I really appreciate you spending the time on these finer details I wouldn't normally catch. Changes have been made; please see the attached. - Thanks for the feedback... I really appreciate you spending the time on these finer details I would not normally catch. Changes have been made - please see the attached. - Thanks for the feedback, because I really appreciate you spending the time on these finer details I would not normally catch... changes have been made, so please see the attached. - Thanks for the feedback - I really appreciate you spending the time on these finer details I would not normally catch. Changes have been made... please see the attached. - Thanks for the feedback. I really appreciate you spending the time on these finer details I would not normally catch; Changes have been made. Please see the attached! All say different things, obviously, depending on what you're trying to convey. What the original sentence conveys is "I write like I talk and I talk like I can't stick up for myself and I'm never sure when my sentences are finished." How does he want to come across? 'cuz English is a crushingly varied language precisely so that this sort of semiotic payload can be contained within the choice of "where you put the dots."Thanks for the feedback, because I really appreciate you spending the time on these finer details (THAT) I would not normally catch.