Complex sentence: The Crime Scene Unit (CSU) is a part of the NYPD Detective Bureau's Forensic Investigations Division, responsible for forensic investigations of all homicides and sexual assaults, as well as other crimes as deemed necessary by an investigating supervisor.
Split into simpler sentences: The Crime Scene Unit (CSU) is a unit within the Forensic Investigations Division of the New York City Police Department Detective Bureau. The Unit is responsible for forensic investigations of all homicides and sexual assaults, as well as other crimes as deemed necessary by an investigating supervisor.