Complex sentence: During the Secret War, Janet is captured by Magneto, however she turns the situation to her advantage by pretending to be seduced, learning Magneto's plans, and then defeats the mutant before leaving to alert the Avengers.
Split into simpler sentences: During the Secret War, Janet is captured by Magneto. However she turns the situation to her advantage by pretending to be seduced; she learns Magneto's plans and then defeats the mutant before leaving to alert the Avengers.