A young blond girl is eating her frozen snack while sitting on a bench next to a red stroller.
a girl eats on a bench near a stroller
Near is a way of saying next to.
Eats and eating is similar action.  Being next to a stroller is being near it.
"A young blond girl is eating her frozen snack while sitting on a bench next to a red stroller. " is rephrased as " A girl eats on a bench near a stroller. "