Voldemort's resurrection potion from Goblet of Fire reads:
‘Bone of the father, unknowingly given, you will renew your son!
Flesh – of the servant, willingly given, you will revive your master.
Blood of the enemy, forcibly taken, you will resurrect your foe.’
Goblet of Fire - pages 556-557 - Bloomsbury - Chapter thirty-two, Flesh, Blood and Bone
It seems like a pretty simple spell and is ancient Dark Magic (According to Voldemort in Goblet of Fire in the chapter Blood, Bone and Flesh.). Dark Magic is Voldemort's specialty:
'You call it “greatness”, what you have been doing, do you?’ asked Dumbledore delicately.
'Certainly,’ said Voldemort, and his eyes seemed to burn red. ‘I have experimented; I have pushed the boundaries of magic further, perhaps, than they have ever been pushed –'
Half-Blood Prince - Page 415 - Bloomsbury - Chapter twenty, Lord Voldemort's Request
Why did it take Voldemort thirteen years to figure out the components of the resurrection potion?
I'm looking for an answer grounded in canon (the 10 Harry Potter books, J.K. Rowling interviews or quotes). A subjective answer in the spirit of canon is also very welcome. I am not looking for an answer from the HP Wikia.