When a Fusion Monster on the field is destroyed and sent to the Graveyard, you can Special Summon from your Graveyard 1 of the Fusion Material Monsters that you used for the Fusion Summon of that Fusion Monster.
For some dumb ass reason this card NEVER works. I've tested it many many times and it NEVER works. I've used normally fusion summoned monsters, I've used the Hex-Sealed Fusion monsters, everything. It NEVER works. Busted ass piece of shit.