Argentina and Britain announced an agreement Thursday to restore full diplomatic ties nearly eight years after they fought a 74-day war over the Falkland islands.
It can take a while to make an agreement after you have fought a war.
From the context we know that it took 8 years for them to come to an agreement, therefore it is definitely correct to say that It can take a while to make an agreement after you have fought a war.
( z1 possible :ARG1 ( z2 take :ARG0 ( z3 agree :ARG0 ( z4 you ) :time ( z5 after :op ( z6 fight :ARG0 z4 :ARG2 ( z7 war ) ) ) ) :ARG1 ( z8 while ) ) )