Complex sentence: The pits have been used by H.G. Wells as the site of the first Martian landing in his novel "The War of the Worlds", the Martians emerge from their craft and fire the Heat-Ray at the bystanders.
Split into simpler sentences: The pits have been used by H.G. Wells as the site of the first Martian landing in his novel "The War of the Worlds". The Martians emerge from their craft and fire the Heat-Ray at the bystanders.