Complex sentence: According to Apollodorus, he was (along with Porphyrion), the greatest of the Giants; immortal while fighting in his native land, he was dragged from his homeland and killed by Heracles.
Split into simpler sentences: According to Apollodorus, he was, the greatest of the Giants (along with Porphyrion). Immortal while fighting in his native land, he was dragged from his homeland and killed by Heracles.