meaning - How do I understand a sentence without subject and verb in novels?

She was meant to stay indoors but everything looked varnished and bright after the rain, so she put her coat on and went outside, then came back in and slung the camera over her shoulder. Through the sopping grass and down towards the river. It was wide and brown today, and it rippled and churned. There were deep creases when it went round rocks and a hollow, clunking noise. It looked strong, like a muscle. When she threw in a stick, the stick didn't float on the surface – it got dragged under, as if something had reached up to grab it. She walked along the bank and there was the bridge she'd seen in some of the photos – it had rusty railings and a broken plank in the middle.

It's an excerpt from a novel 'Weathering'. And I've never really read any English novels so these kind of sentences are hard for me to understand..

Does this 'Through the sopping grass and down towards the river.' sentence just describe the background image? There aren't any verb or subject so I'm confused.

Also there are so many 'it's and I don't understand at all what it means.

Answer

Indeed artistic or poetic language, as is often found in novels, can be hard to understand by someone who isn't yet completely fluent in the language.

The incomplete sentence

Through the sopping grass and down towards the river.

This is an incomplete sentence, used for artistic effect. You could fill in the rest of the sentence like this:

She walked through the sopping grass and down towards the river.

A way of speaking, recognized by all fluent speakers, is to say a direction, without a verb, as a command. For example, a sergeant can order soldiers in formation to march by saying "Forward!" It would be very abrupt, but you could order someone to go into a car by saying "Into the car!" The incomplete sentence you found doesn't give an order, but these examples illustrate how a mere prepositional phrase describing a path without a verb easily suggests motion in English: motion along that path. Given the preceding context, which suggests that "she" isn't going to stay indoors, and has just gotten her camera, a (very fluent) reader easily understands that motion is suggested: "she" is moving—probably to a place where she can do something with the camera.

I took a quick look at the surrounding context and found another incomplete sentence like this, a paragraph earlier:

A night of heavy rain which left the trees dripping.

I get the impression that the author intends these incomplete sentences somewhat like "establishing shots" in movies. The author used each of them as transitions. After each one, the author added full sentences that go into more detail about the new scene or location.

"It"

Each it that you marked in bold refers to the river. The first It is a little jarring even to a fluent speaker, because the phrasing parallels the way people usually describe the weather: "It was raining", "It is sunny today", etc. Maybe the author intended that parallel, because of the word "today". The ambiguity clears up when you reach "rippled and churned". The only thing mentioned nearby that could be "wide and brown" and could "ripple and churn" is the river.