Complex sentence: Tesla teams up with the Sanctuary to reverse the transformation, but loses his own Vampiric powers in the process, though Tesla decides to continue in his efforts to take over the world and discovers that he has the ability to use magnetic forces.
Split into simpler sentences: Tesla teams up with the Sanctuary to reverse the transformation, but loses his own Vampiric powers in the process. He then decides to continue in his efforts to take over the world and also discovers that he has the ability to use magnetic forces.