Complex sentence: He delivers a eulogy to his current form, hallucinates a final farewell to Amy Pond, and regenerates into the Twelfth Doctor, who declares that the TARDIS is crashing and asks Clara if she knows how to fly it.
Split into simpler sentences: He delivers a eulogy to his current form, hallucinates a final farewell to Amy Pond, and regenerates. The Twelfth Doctor then declares that the TARDIS is crashing and asks Clara if she knows how to fly it.