Complex sentence: He painted "Nemesis" pursuing a Murderer a flat stretch of landscape, with a slaughtered body, while in front is the assassin speeding away into the darkness, and above an angel of vengeance.
Split into simpler sentences: He painted "Nemesis" pursuing a murderer across a flat stretch of landscape. A slaughtered body lies on the ground, while in front is the assassin speeding away into the darkness, and above an angel of vengeance.