Complex sentence: Matecki and he then went back inside and cleaned all the blood off the furniture and floor, after which they searched the house for documents with Cullotta and Spilotro's names on them, as well as security cameras and recorders, of which they found none.
Split into simpler sentences: Matecki and he then went back inside and cleaned all the blood off the furniture and floor. After which they searched the house for documents with Cullotta and Spilotro's names on them, as well as security cameras and recorders, of which they found none.