Complex sentence: Adding new information in the middle of a "paragraph" that used a single citation at the end is, I admit, tricky, and a good argument for ""... but still, if you're adding something: cite it !
Split into simpler sentences: Adding new information in the middle of a "paragraph" that used a single citation at the end is admittedly tricky, and a good argument for "". But still, if you're adding something: cite it!