Complex sentence: He came to believe that the "Nurse M" (or "Nurse X" in court documents) investigation had been incomplete, that the suspect was still dangerous, and this was his alleged motivation for blogging the suspects name in 2009.
Split into simpler sentences: He came to believe that the "Nurse M" (or "Nurse X" in court documents) investigation had been incomplete, that the suspect was still dangerous. This was his alleged motivation for blogging the suspects name in 2009.