Complex sentence: Galactus returned to Zenn-La where he is confronted by Shalla Bal and after learning that former love had been exiled on Earth, she asked Galactus to make her his herald if he spared her planet origin.
Split into simpler sentences: Galactus returned to Zenn-La where he is confronted by Shalla Bal. After learning that her former love had been exiled on Earth, Shalla Bal asked Galactus to make her his herald if he spared her planet origin.