Is Not Null

Hello,

I'm looking for some help using if( not is null)...

I have a field called "Seat #" and another called "Verification Cleared?."
"Verification Cleared?" is multiple-choice that can have the response of "N/A," "Approved,"  "Denied," or "Pending."

I'm trying to create a formula that says if "Seat #" is not null and "Verification Cleared?" = "Pending" to be called "Incomplete".  Or if "Seat #" is not null and "Verification Cleared?" = any of the other options in the M/C to be called "Complete."

This is what I currently have:

ToText(If(not IsNull([Seat #]), "",
[Verification Cleared?] = "Pending",
"Incomplete",
"Complete"))

I added the "ToText" because it was giving me the yellow highlight for "Seat #" that it was expecting a date or number.  When I have it as the formula I have now, it just comes out blank.  The formula will work if I just have it If(IsNull), but it will still have that yellow highlight for Seat #.  

What should I change to make this work?  Thank you!