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I don't know how to read this effect. I am interested in learning how to decipher effects that use the same way of writing card effects.

Latinum, Exarch of Dark World

If this card is discarded to the Graveyard by a card effect: If it was discarded from your hand to your Graveyard by an opponent's card effect, target 1 Fiend-Type monster on the field; Special Summon this card from the Graveyard, then that target (if any) gains 500 ATK.

Dark Worlds have been poorly worded.

Read it like this...

If this card was discarded to the graveyard by a card effect:
Do this bit only if it was discarded by an opponent's card effect;
Special Summon this card, then do the other thing.

Hope you can read it easier now.

If you want to learn more about punctuation in Card texts, I suggest you read this.

Thanks guys!