Après le dîner, Paul enlève ses bottines marron, met ses chaussons, et dit qu’il ne veut plus ni steak ni frites ce soir.

Après le dîner is the most neutral, standard way to say after dinner here.

A few useful points:

• French very often uses an article with meals: le déjeuner, le dîner, le petit-déjeuner.
• So après le dîner literally means after the dinner, but in natural English we just say after dinner.
• Après dîner does exist, but it sounds more fixed, literary, or stylistically marked in many contexts.

So for a learner, après le dîner is the safest and most natural choice.

Because all three verbs have the same subject: Paul.

So French, like English, can list actions with one subject:

• Paul enlève..., met..., et dit...

This works just like:

• Paul takes off..., puts on..., and says...

You only need to repeat the subject if you want emphasis, contrast, or clearer structure.

Here it means takes off.

The verb enlever has several meanings depending on context, including:

• to remove
• to take off clothing or shoes
• sometimes even to kidnap

In this sentence, because the object is ses bottines, the meaning is clearly takes off his brown ankle boots.

So context is doing the work.

Here ses means his, because it refers to Paul’s things.

Important rule: French possessive adjectives agree with the thing possessed, not with the owner.

So:

• son = his/her + singular masculine noun
• sa = his/her + singular feminine noun
• ses = his/her + plural noun

Since bottines and chaussons are both plural, French uses ses in both cases.

So ses does not mean the owner is plural. It just means the possessed nouns are plural.

Because marron as a color adjective is usually invariable.

So French says:

• des bottines marron
• not normally des bottines marronnes

This happens because many color words that originally come from nouns stay unchanged, such as:

• marron
• orange
• sometimes others in similar patterns

So even though bottines is feminine plural, marron stays marron.

• bottines = ankle boots, or short boots
• chaussons = slippers, soft indoor shoes, or house shoes

So the image is:

• Paul takes off his ankle boots
• then puts on his slippers

A related word is pantoufles, which also means slippers.
Chaussons can sometimes sound a bit softer or more like slip-on indoor footwear.

Qu’ is short for que, and it introduces reported speech or a subordinate clause.

So:

• Paul dit qu’il ne veut plus... = Paul says that he no longer wants...

Because que comes before il, French contracts it:

• que il → qu’il

This contraction is required.

So dit qu’il is just says that he...

Ne... plus means no longer or not anymore.

So:

• il ne veut plus means
• he no longer wants
• he doesn’t want anymore

That is stronger and more specific than just ne veut pas, which would simply mean doesn’t want.

Compare:

• Il ne veut pas de steak. = He doesn’t want steak.
• Il ne veut plus de steak. = He doesn’t want steak anymore.

In everyday spoken French, people often drop ne, so you may hear:

• il veut plus

But in standard written French, ne... plus is expected.

Ni... ni means neither... nor.

Here it links two things Paul does not want:

• ni steak ni frites = neither steak nor fries

Because the sentence already has a negative idea with ne... plus, the whole meaning is:

• he no longer wants either steak or fries tonight
• more naturally: he wants neither steak nor fries tonight anymore

So ni... ni is the standard way to join two negative alternatives in French.

Because after negation, especially with ni... ni, French often drops the article.

So instead of something like:

• un steak
• des frites

you get:

• ni steak ni frites

This is very normal.

Compare:

• Il veut un steak et des frites. = He wants a steak and fries.
• Il ne veut ni steak ni frites. = He wants neither steak nor fries.

So the lack of articles here is part of standard negative French structure.

Ce soir can mean either tonight or this evening, depending on context.

In this sentence, it means that this is true for tonight / this evening.

French often places time expressions like ce soir at the end of the sentence, especially when they modify the whole statement:

• ... il ne veut plus ni steak ni frites ce soir.

You could also move it earlier for emphasis:

• Ce soir, il ne veut plus ni steak ni frites.

Both are grammatical, but the version in your sentence sounds very natural.

Because the sentence is describing actions as a present-time scene.

French uses the present tense here just as English can:

• Paul takes off..., puts on..., and says...

This can sound like:

• a habitual action
• a scene happening now
• narrative present

If you wanted a completed past event, French would more likely use the passé composé:

• Paul a enlevé ses bottines marron, a mis ses chaussons, et a dit...

So the present here is completely normal for a descriptive or narrative sentence.

They are straightforward food words here:

• steak = steak
• frites = fries

A couple of notes:

• frites is plural, because it refers to fries/chips as individual pieces.
• steak in French is very common and usually refers to a steak or a hamburger-style beef patty depending on context.

In this sentence, the important grammar point is not the vocabulary itself, but how the foods are placed after ni... ni without articles.