IIF Statement Help

I’m looking to write an IIF statement to use as the control source for the
ATTDATE2 field. I have a form called GeneralForm with a subform on it called
HistoryForm.

My goal is to have:
=IIF([SIGNWORK]=�Install� OR “Replace� OR “Relocate & Replace� AND
[FACETYPE]=�High Intensity� OR “Diam. Grade�,[COMPDATE]+7305)

Signwork and Facetype are both combo boxes. I’ve tried nesting IIF and it
will work (see below), but when I try a third string, I get an error message
about the wrong number of arguments. Plus, it’s complex and I’m sure there’s
a better way to do this.

Tried and works like this only:
=IIf([SIGNWORK]="INSTALL" And [FACETYPE]="DIAM. GRADE",[COMPDATE]+7305,
IIf([SIGNWORK]="REPLACE" And [FACETYPE]="HIGH INTENSITY",[COMPDATE]+7305))

Any suggestions would be appreciated.
Thanks!
Cathy