Use Uncombine 
to break apart an object combined with Make Holes 
.
Shortcuts
-
Draw Tab, Combine:
-
Keys: Alt, D, P, U
Uncombine a Combined Object
-
Use Box Select
or another selection tool to select an object that you combined with Make Holes 
. -
In the Combine area of the Draw tab, click Uncombine
. The combined object is split into separate paths, and any holes in fill areas have now gone.
The lines and fills remain the same colors that they were when combined.