Complex sentence: After staging a breakout, they free a female Chimera Sui Generis (Vilgax's species) named Myaxx, who is Azmuth's assistant; she had switched her DNA signature for Azmuth's when he refused to give her credit for helping to create the Omnitrix.
Split into simpler sentences: After staging a breakout, they free a female Chimera Sui Generis (Vilgax's species) named Myaxx, who is Azmuth's assistant. She switched her DNA signature for Azmuth's when he refused to give her credit for helping to create the Omnitrix.