Complex sentence: She plans to have the demon god born, but when Heather swallowed the Aglaphaotis and vomited the fetus of the demon god, Claudia immediately shoved Heather and swallowed the fetus.
Split into simpler sentences: She plans to have the demon god born. But when Heather swallowed the Aglaphaotis and vomited the fetus of the demon god, Claudia immediately shoved her and swallowed the fetus.