Complex sentence: In April 2013, archaeologists announced the discovery of an ancient harbor and dozens of papyrus documents at the location, those are the oldest papyrus ever found in Egypt (ca.2560-2550 BC, end of the reign of Khufu).
Split into simpler sentences: In April 2013, archaeologists announced the discovery of an ancient harbor and dozens of papyrus documents at the location. Those are the oldest papyrus ever found in Egypt (ca.2560-2550 BC, end of the reign of Khufu).