Complex sentence: The Beauty-Princess Tsarevna Nenaglyadnaya Krasa is imprisoned by the evil wizard Kashchey the Immortal in his gloomy kingdom, longing for her beloved Prince Ivan-Korolevich.
Split into simpler sentences: The Beauty-Princess Tsarevna Nenaglyadnaya Krasa is imprisoned by the evil wizard Kashchey the Immortalin in his gloomy Kingdom. She is longing about her beloved Prince Ivan-Korolevich.