Complex sentence: It is there that Tapp discovers that Jigsaw has captured Melissa Sing, Detective Sing's Widow, who has become a neglectful parent and is convinced that it is Tapp's fault that her husband was killed.
Split into simpler sentences: It is there that Tapp discovers that Jigsaw has captured Melissa Sing, Detective Sing's widow. She has become a neglectful parent and is convinced that it is Tapp's fault that her husband was killed.