Le secourisme est essentiel, d’autant plus que Paul s’étouffe.

Because essentiel agrees with le secourisme, and secourisme is a masculine singular noun.

• le secourisme → masculine singular
• so the adjective is essentiel

If the noun were feminine, you would use essentielle instead.

Le secourisme refers to first aid, emergency aid skills, or the practice of giving first aid.

It is a fairly specific noun. In everyday French, people also often say:

• les premiers secours = first aid
• le secouriste = a first-aid responder
• porter secours = to give help / come to someone’s aid

So le secourisme est essentiel means that first-aid knowledge/training is essential.

D’autant plus que is a fixed expression meaning something like:

• all the more because
• especially since
• even more so because

It strengthens the first statement by adding a reason.

So the structure is:

• statement 1: Le secourisme est essentiel
• stronger reason: d’autant plus que Paul s’étouffe

In natural English, this often sounds like:

• First aid is essential, especially since Paul is choking.

Because d’autant plus que is a complete linking expression. The que introduces the reason or explanation that follows.

Think of it as one chunk:

• d’autant plus que = all the more because / especially since

You normally learn it as a set phrase, not as separate words you build freely each time.

There is also a related pattern:

• d’autant plus ... que ...

But in this sentence, d’autant plus que functions as the connector before the clause Paul s’étouffe.

S’étouffe comes from the verb s’étouffer, which is a pronominal verb.

Base verb:

• étouffer = to suffocate, to smother, to choke something

Pronominal form:

• s’étouffer = to choke, to be choking, to suffocate

Here:

• Paul s’étouffe = Paul is choking

The s’ is the reflexive/pronominal pronoun se, shortened to s’ before a vowel.

Compare:

• Il étouffe quelqu’un = He is choking/smothering someone
• Il s’étouffe = He is choking

It is the present indicative.

The verb is s’étouffer, and the form s’étouffe is:

• je m’étouffe
• tu t’étouffes
• il / elle / on s’étouffe
• nous nous étouffons
• vous vous étouffez
• ils / elles s’étouffent

In this sentence, the present tense describes something happening now or a current situation.

Not always. It can be used:

1. Literally

   • choking on food
   • being unable to breathe properly

2. More broadly

   • suffocating
   • feeling stifled

3. Figuratively, in some contexts

   • s’étouffer de rire = to choke with laughter
   • s’étouffer d’indignation = to be speechless/choked with indignation

In your sentence, it is most naturally understood as literal choking, which fits the first-aid context.

The comma separates the main statement from the added explanatory clause.

• Le secourisme est essentiel = main idea
• d’autant plus que Paul s’étouffe = added reason

In writing, French often uses a comma here just as English would before a phrase like especially since or all the more because.

In French, general ideas are usually expressed with an article.

So when talking about something in a general sense, French often uses:

• Le sport est important.
• La patience est utile.
• Le secourisme est essentiel.

English often drops the article in these cases, but French usually keeps it.

Parce que simply gives a reason:

• Le secourisme est essentiel parce que Paul s’étouffe.

That means:

• First aid is essential because Paul is choking.

But d’autant plus que does more than just give a reason. It intensifies the first statement. It means the first statement is even more true because of what follows.

So:

• parce que = because
• d’autant plus que = all the more because / especially since

Using d’autant plus que makes the sentence sound stronger and more emphatic.

The apostrophe shows that de has contracted before a vowel:

• de + autant → d’autant

This kind of contraction is very common in French.

Pronunciation notes:

• d’autant sounds roughly like do-tahn
• the t in autant is heard here because it links smoothly into the next word
• s’étouffe begins with a vowel sound, so the flow of the sentence is quite connected

You do not pronounce the apostrophe itself; it just marks the missing e from de.