Complex sentence: When Mera arrive home of Xebel to warns them, it was reveals that she was the former husband Nereus is the current king of Xebel, he asking for his lover Mera "Where the hell have you been?".
Split into simpler sentences: When Mera arrive home of Xebel to warns them, it was revealed that she was the former wife of Nereus who is the current king of Xebel. He asks Mera "Where the hell have you been?".