Complex sentence: His papers were found, some of recent date in paper bags; incriminating letters of earlier years were in a deal box, slightly nailed down; inexplicably, Coleman continued to deny having written them for sevdral weeks after they were discovered.
Split into simpler sentences: His papers were found, some of recent date in paper bags; incriminating letters of earlier years were in a deal box, slightly nailed down. Inexplicably, Coleman continued to deny having written them for several weeks after they were discovered.