Complex sentence: Harry Ellis, Al Powell, and Dwayne Robinson were essentially the same, but the FBI agents Johnson and Johnson were added; and the primary antagonist Anton "Little Tony" Gruber became Hans Gruber, while Karl's brother Hans was renamed Anton.
Split into simpler sentences: Harry Ellis, Al Powell, and Dwayne Robinson were essentially the same, but the FBI agents Johnson and Johnson were added. The primary antagonist Anton "Little Tony" Gruber became Hans Gruber, while Karl's brother Hans was renamed Anton.