I found this phrase in a few news headlines like this:
Government Set To Ease Drug Laws.
There are two parts to the expression: "set", meaning ready or about to - and "to ease", meaning to relax or to loosen.
Government set to ease drug laws.
could also be:
Government ready to relax drug laws.
Government about to loosen drug laws.
I can't give you an academic explanation of the terms, but I hope this helps.