Complex sentence: It dates back to Predynastic Egypt and was still very popular during the 19th dynasty reign of Pharaoh Ramesses II. The festival was connected with the worship of the king and was held in the last month of the summer.
Split into simpler sentences: It dates back to Predynastic Egypt and was still very popular during Ramesses II's time. It was connected with the worship of the king and was carried out in the last month of the summer.