Complex sentence: Investigations can fall into four categories, the most common of which is forensic analysis, in which evidence is recovered to support or oppose a hypothesis before a criminal court, closely related to intelligence gathering, in which material is intended to identify other suspects/crimes.
Split into simpler sentences: Investigations can fall into four categories, the most common of which is forensic analysis, in which evidence is recovered to support or oppose a hypothesis before a criminal court. This is closely related to intelligence gathering, where material is intended to identify other suspects/crimes.