Complex sentence: Kenneth claimed he was in San Mateo, far from home, at the time of the murder, but phone records showed that a call he received at that time was routed through a cell tower in the Fitzhugh's neighborhood.
Split into simpler sentences: Kenneth claimed he was in San Mateo, far from the home, at the time of the murder. However, phone records showed that a call he received at that time was routed through a cell tower in the Fitzhugh's neighborhood.