Complex sentence: Sivanandam and Naidu decide to interrogate Pattabi, who feels remorse for Rajan's death, and admits that he did not treat his brother well, and failed to understand his good intentions.
Split into simpler sentences: Sivanandam and Naidu decide to interrogate Pattabi, who feels remorse for Rajan's death. He admits that he did not treat his brother well, and failed to understand his good intentions.