Complex sentence: He was a commentator on Fox News Channel, hosting "Heartland with John Kasich" (2001--2007); he also worked as an investment banker, as managing director of Lehman Brothers's Columbus, Ohio office until the firm collapsed in 2008.
Split into simpler sentences: He was a commentator on Fox News Channel, hosting "Heartland with John Kasich" (2001--2007). He also worked as an investment banker, as managing director of Lehman Brothers' Columbus, Ohio office until the firm collapsed in 2008.