Complex sentence: Underwood is an Americanized version of the original BBC character Francis Urquhart, a Machiavellian post-Margaret Thatcher chief whip of the Conservative Party.
Split into simpler sentences: Underwood is an Americanized version of the original BBC character Francis Urquhart. Urquhart was a fictional Machiavellian post-Margaret Thatcher chief whip of the Conservative Party.