Complex sentence: By the events of "Something Rotten", Kaine had advanced to the office of Chancellor, making him the second most powerful man in the land and was using Mycroft Next's ovinator to manipulate Parliament into doing what he wanted.
Split into simpler sentences: By the events of "Something Rotten", Kaine had advanced to the office of Chancellor, making him the second most powerful man in the land. He was using Mycroft Next's invention, the Ovinator, to manipulate Parliament into doing what he wanted.