I was able to accomplish this with the indent feature of line rules.  This doesn't seem to be well documented, so here is how I did it.  Indents act like a set of parentheses on a logical operator.  I created my rules and they were displayed like so:

A

AND

B

AND

C

OR

D

Then I clicked the "OR" operator, and clicked the "Indent Right" button.  The "C", "D" and "OR" were all shifted right and this accomplished what I wanted.

Awesome! Thanks for sharing!