Complex sentence: Sandeman, a cult member and Max's creator, betrayed the cult and decided to give this genetic immunity to the rest of through Max, who would be the savior of the human race.
Split into simpler sentences: Sandeman, a cult member and Max's creator, betrayed the cult and decided to give this genetic immunity to the rest of humanity. Sandeman found a way to spread this genetic immunity to everyone through Max, who would be the savior of the human race.