Alertons le secouriste, d’autant plus que Paul saigne.

Alertons is the nous imperative form of alerter.

That means it expresses let’s alert... or let us alert.... The speaker is including themselves in the action.

Compare:

• Alerte le secouriste. = alert the first-aider/rescuer (to one person, informal)
• Alertons le secouriste. = let’s alert the first-aider/rescuer
• Alertez le secouriste. = alert the first-aider/rescuer (to one person formal, or to several people)

So alertons is the right form if the idea is let’s do this.

Because this is an imperative, and in French the subject pronoun is normally omitted in the imperative.

So:

• Nous alertons le secouriste. = we are alerting the first-aider/rescuer
• Alertons le secouriste. = let’s alert the first-aider/rescuer

Even though alertons is the nous form, French does not normally say Nous alertons when giving this kind of command or suggestion.

Un secouriste is a person trained to give emergency help or first aid.

Depending on context, it can be translated as:

• first-aider
• rescuer
• emergency responder
• sometimes medic or lifeguard, if the situation makes that clear

So the exact English word depends on the setting, but the basic idea is someone who provides emergency assistance.

Le secouriste means the first-aider/rescuer, so it suggests a specific or contextually identifiable person.

French often uses the definite article when the person is understood from the situation, even if English might sometimes prefer a different wording.

For example:

• Alertons le secouriste. = let’s alert the first-aider/rescuer
• Alertons un secouriste. = let’s alert a first-aider/rescuer

Using le makes it sound like there is a known emergency helper nearby or one assigned to that place or event.

D’autant plus que is an idiomatic expression meaning something like:

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

It adds an extra reason that strengthens what comes before.

So here, the idea is:

• Let’s alert the first-aider, especially since Paul is bleeding.

It is stronger than just parce que, because it means the second clause gives an additional reason that makes the first statement even more justified.

The apostrophe is there because de becomes d’ before a vowel sound.

So:

• de + autant → d’autant

This is just normal French elision, the same kind of change you see in:

• le ami → l’ami
• je ai → j’ai
• de accord → d’accord

In this sentence, d’autant plus que is a fixed expression, so you should learn it as one whole chunk.

French often uses the simple present where English uses the present progressive.

So:

• Paul saigne can mean Paul bleeds or, more naturally in this context, Paul is bleeding

The verb saigner means to bleed.

French does not need a separate form like English is bleeding here. The present tense is enough.

It is natural, but alerter sounds a bit more formal, official, or emergency-related than some other verbs.

In a real urgent situation, people might also say things like:

• Appelons le secouriste. = let’s call the first-aider/rescuer
• Va chercher le secouriste. = go get the first-aider/rescuer
• Il faut prévenir le secouriste. = we need to warn/inform the first-aider/rescuer

So Alertons le secouriste is correct and natural, especially in instructions, announcements, or emergency contexts, but it has a slightly more formal or procedural feel than some everyday alternatives.

The comma separates the main idea from the added justification.

• Alertons le secouriste = main statement
• d’autant plus que Paul saigne = extra reason that strengthens it

The comma is very natural here because the second part feels like an added explanatory remark. In French punctuation, this helps readability and makes the sentence easier to process.

Even without discussing strict punctuation rules, the important thing for a learner is that the comma marks the second clause as an additional reason.