Complex sentence: The prototype for the main character Skawiński was the Pole Siellawa-a lighthouse-keeper, who had lost the job because he had been neglecting his duties due to reading "Murdelio" by Zygmunt Kaczkowski.
Split into simpler sentences: The prototype for the main character Skawiński was the Pole Siellawa-a lighthouse-keeper. The reason of his layoff was neglecting his duties due to reading "Murdelio" by Zygmunt Kaczkowski.