Complex sentence: Stephen Kevin "Steve" Bannon (born November 27,1953) is the Chief Strategist and Senior Counselor to United States President Donald Trump, and prior to assuming those positions was Trump's 2016 presidential campaign manager, and a businessman and media executive.
Split into simpler sentences: Stephen Kevin "Steve" Bannon (born November 27,1953) is the Chief Strategist and Senior Counselor to United States President Donald Trump. Prior to assuming those positions, he was Trump's 2016 presidential campaign manager, and a businessman and media executive.