Complex sentence: Rubens used his young wife Helena Fourment as the model for the nymph on the far left being held aloft by a leering satyr as she lewdly clutches his horns and stares out of the canvas at the viewer with a knowing look.
Split into simpler sentences: Rubens used his young wife Helena Fourment as the model for the nymph on the far left. She is being held aloft by a leering satyr as she lewdly clutches his horns and stares out of the canvas at the viewer with a knowing look.