Complex sentence: The painting portrays a young gentleman concealed in the bushes, observing a lady on swing a being pushed by her spouse, who is standing in the background, in hidden in the shadows, as he is unaware of the affair.
Split into simpler sentences: The painting portrays a young gentleman concealed in the bushes, observing a lady on swing a being pushed by her spouse. Her husband is hidden in the shadow, as he is unaware of the affair.