Complex sentence: Sarah Jane and Sky go to meet Luke and in the attic Clyde and Rani scan the Serfboard to uncover anything alien about; it is just a cheap, ordinary computer.
Split into simpler sentences: Sarah Jane and Sky go to meet Luke and in the attic Clyde and Rani scan the Serfboard to uncover anything alien about it. The two discover that the SerfBoard is just a cheap, ordinary computer.