Complex sentence: With the Pennsylvania special election in chaos, Underwood convinces the Vice President to step down and run for his old position of governor, which was Underwood's plan from the start to gain the vice presidency.
Split into simpler sentences: With the Pennsylvania special election in chaos, Underwood is able to convince the Vice President to step down and run for his old position of governor. It is revealed that this was Underwood's plan from the start in order to seek the vice presidency.