Complex sentence: Meanwhile, Kato becomes the new Chairman, making new profits in the stock market and forging new relationships with the police force and making a surviving member of Otomo's gang his new right-hand man.
Split into simpler sentences: Meanwhile, Kato becomes the new Chairman, making new profits in the stock market and forging new relationships with the police force. He makes a surviving member of Otomo's gang his new right-hand man.