General ⇒ Adding pages to double citations

[bartomeu vallori]

I've got a problem with double citations e.g. \cite{jones2000,jones1850} when I want to add specific pages to them both.
I know the way for adding pages to a single cite: \cite[345]{Jones2000}, but this doesn't work when I have two or more cites together. The result I wish is: (Jones, 2000: 345; Jones, 1850: 123).
The .bst I've been using is authordate3