Complex sentence: In 1045, Airlangga abdicated his throne to resume the life of an ascetic, and divided the kingdom between his two sons, Janggala and Panjalu (Kediri) and from this point on, the kingdom was known as Kediri.
Split into simpler sentences: In 1045, Airlangga abdicated his throne to resume the life of an ascetic. He divided the kingdom between his two sons, Janggala and Panjalu (Kediri) and from this point on, the kingdom was known as Kediri.