Complex sentence: After 17 weeks of promotion, the Emmalina character first appeared on the 13 February episode of "Raw", only to promptly announce "the makeover from Emmalina to Emma".
Split into simpler sentences: After 17 weeks of promotion, Emmalina debuted on the 13 February episode of "Raw". Upon her debut, she announced that the audience would see "the makeover from Emmalina to Emma".