Two ladies in matching dresses and shoes, both wearing straw hats pulled down over their faces, are napping on a bench next to a rolling suitcase.
two ladies nap on a bench
If two ladies are napping on a bench then they have taken a nap on the bench.
"Two ladies nap on a bench" is a rephrasing of "Two ladies in matching dresses and shoes, both wearing straw hats pulled down over their faces, are napping on a bench next to a rolling suitcase."
Two ladies in matching dresses are types of two ladies, and nap on a bench is a paraphrase of napping on a bench.