Complex sentence: It is only a person who is on the righteous side of "Ogu-na-Ofo" that can call its name in prayer, otherwise such a person will face the wrath of Amadioha (the god of thunder and lightning).
Split into simpler sentences: It is only the one who is on the side of "Ogu-na-Ofo" that can call its name in prayer. Otherwise such a person will face the wrath of Amadioha (the god of thunder and lightning).