Is this what you want
IF(
[Task_SR/SLS Received_Check]="Complete","Candidate Search",
[Task_Scip Submitted_Check]="Completed", "SCIP Under Review",
[Task_Site Qualification_Check]= "Completed", "In Lease Negotiations")
You had missing quotes and some "dot dot" quotes which have never seen on a normal keyboard.
I also suggest writing these vertically for readability and ease of catching syntax errors.
------------------------------
Mark Shnier (YQC)
Quick Base Solution Provider
Your Quick Base Coach
http://QuickBaseCoach.commark.shnier@gmail.com
------------------------------