Complex sentence: Mr Smith identifies the disturbance as a teleport and a galactic diplomat named Rani (played by Ronnie Corbett) appears in the attic, representing the Galatic Alliance, giving them all gifts for defending the Earth so valiantly.
Split into simpler sentences: Mr Smith identifies the disturbance as a teleport and a diplomat named Rani (played by Ronnie Corbett) appears. He states that he represents the Galactic Alliance and gives them all gifts for defending the Earth so valiantly.