Complex sentence: Sophocles, in a written fragment of one of his works, ascribed the invention of knucklebones to the mythical figure Palamedes, who taught it to his Greek countrymen during the Trojan War.
Split into simpler sentences: Sophocles, in a written fragment of one of his works, ascribed the invention of knucklebones to the mythical figure Palamedes. Who taught it to his Greek countrymen during the Trojan War.