Complex sentence: Myth-Maker, Mosig says that Lovecraft never intended the "Elder Gods" to be benign, protective deities; instead, they are actually ineffectual beings synonymous with Lovecraft's "weak gods of the earth".
Split into simpler sentences: Myth-Maker, Mosig says that Lovecraft never intended the Elder Gods to be benign, protective deities. Instead, they are, according to Mosig, ineffectual beings synonymous with Lovecraft's "weak gods of the earth".