Complex sentence: In the Ramayana, during the battle between Rama and Ravana, when Ravana's son Indrajit is killed, Ravana calls his brother Ahiravana for help.
Split into simpler sentences: In the Ramayana Ahiravan During the battle between Rama and Ravana, Ravana's son Indrajit is killed. At that point, Ravana calls his brother Ahiravana for help.