Original sentence: According to some theories, he was a historical Tamil emperor who reigned over Sri Lanka from 2554 BC to 2517 BC.Ravana kidnapped Sita to claim vengeance on Rama and his brother Lakshmana for having cut off the nose of Ravana's sister.Ravana, the demon king of Lanka, is the primary antagonist of the Hindu epic, the Ramayana.The name Ravana obtains from the root, 'Ra' signifies the sun and 'vana' signifies generation in  Tamil language
Edited sentence: He is a character from ancient Hindu tradition and is the primary antagonist of the historical Hindu epic, the Ramayana.Ravana kidnapped Sita to claim vengeance on Rama and his brother Lakshmana for having cut off the nose of his sister.Ravana was a Hela (Sinhala) emperor who reigned over Sri Lanka from 2554 BC to 2517 BC.The name Ravana obtains from the root, 'Ra' signifies the sun and 'vana' signifies generation in  Sinhala language