المتدرب سجل في الكورس المسائي.

A good approximation is:

el-motadarrib saggal fil-kōrs el-masa’i

A few notes:

• سجل is pronounced saggal in Egyptian Arabic.
• ج in Egyptian is usually a hard g, not an English j.
• في الكورس is often said smoothly as fil-kōrs.
• مسائي contains a glottal stop, so it sounds like ma-sa-ʔi.

Pronunciation can vary a bit from speaker to speaker, but that version will be understood.

Because normal Arabic writing usually leaves out:

• short vowels
• the shadda mark that shows a doubled consonant

So سجل in everyday writing stands for سجّل.

In Egyptian Arabic, this verb is pronounced saggal = he registered / he signed up.

Also, because this is Egyptian Arabic, ج is pronounced g, so you get saggal, not sajjal.

المتدرب means the trainee.

It refers to a person who is being trained or is in training. Depending on context, English might also use words like:

• trainee
• intern
• apprentice

Grammatically, it is:

• masculine
• singular
• definite because of الـ

The feminine form would be المتدربة.

With the meaning to enroll / sign up, Arabic commonly uses:

سجّل في + something

So:

• سجّل في الكورس = he enrolled in the course

This is similar to English enroll in.

Important: the same verb can also mean to record / write down, and in that case it may take a direct object instead:

• سجّل الاسم = he wrote down the name

So في here is tied to the meaning sign up for / enroll in.

الكورس is a very common borrowing from English course.

That is completely normal in Egyptian Arabic. Everyday Egyptian uses many loanwords, especially for education, technology, and modern life.

Depending on context, more formal Arabic alternatives could be:

• دورة for a training course
• مقرر for an academic course or subject

But in Egyptian speech, كورس is very common and natural.

Because in Arabic, adjectives normally come after the noun they describe.

So:

• الكورس المسائي = the evening course

This is the opposite of English, where the adjective usually comes first:

• the evening course

Here:

• الكورس = the course
• المسائي = evening / evening-time

So literally, Arabic says something like the course evening.

Because Arabic adjectives agree with the nouns they describe in definiteness.

Since the noun is definite:

• الكورس = the course

the adjective must also be definite:

• المسائي = the evening

So you get:

• الكورس المسائي = the evening course

If the noun were indefinite, the adjective would also be indefinite:

• كورس مسائي = an evening course

This matching is very important in Arabic.

It is an adjective meaning evening or evening-time.

It comes from مساء, which means evening.

So مسائي is the adjectival form: something related to the evening.

In this sentence, it describes الكورس, so it means:

• the evening course
• not a morning course, for example

It is understandable and natural, but it sounds a bit mixed in register.

• سجّل and الكورس are very normal in Egyptian speech.
• المتدرب and especially المسائي sound a bit more formal or written.

So this sentence feels fine, especially in semi-formal contexts, education, training, or announcements.

In very casual speech, many people might say something like:

• المتدرّب سجّل في الكورس بالليل

That is more everyday spoken Egyptian in tone.

Yes.

Your sentence is:

• المتدرب سجل في الكورس المسائي

This starts with the subject, which is very common in Egyptian Arabic.

You could also say:

• سجّل المتدرب في الكورس المسائي

That starts with the verb. This is also correct.

Very roughly:

• subject first can feel a bit more conversational or can slightly emphasize who
• verb first can feel a bit more neutral or more classically Arabic

In Egyptian speech, subject-first order is extremely common.

Here are some useful Egyptian Arabic versions:

• المتدرب بيسجل في الكورس المسائي
  The trainee is enrolling / enrolls in the evening course

• المتدرب هيسجل في الكورس المسائي
  The trainee will enroll in the evening course

And if you change the subject:

• المتدربة سجلت في الكورس المسائي
  The female trainee enrolled in the evening course

• المتدربين سجلوا في الكورس المسائي
  The trainees enrolled in the evening course

This is a good sentence for practicing both verb forms and agreement.