Complex sentence: Whereas in the televised story Ixta is the son of the architect, in the book he is the grandson, and Lucarotti updates Ian and Barbara as travellers from the 1980s.
Split into simpler sentences: Whereas in the televised story Ixta is the son of the architect, in the book he is the grandson. John Lucarotti updates Ian and Barbara as travellers from the 1980s.