Complex sentence: Lou Smit, a seasoned detective who came out of retirement to assist Boulder authorities with the case in early 1997, assessed the evidence and concluded that an intruder had committed the crime.
Split into simpler sentences: Lou Smit, a seasoned detective who came out of retirement to assist Boulder authorities with the case in early 1997. After assessing all the evidence that had been collected, Smit concluded that an intruder had committed the crime.