Mlalamikaji na mlalamikiwa wamefika kwa ajili ya usikilizaji.

Because the subject is two people: mlalamikaji na mlalamikiwa.

In Swahili, when two nouns are joined by na meaning and, the verb normally takes a plural subject marker. Since these are people, the plural subject marker is wa-.

So:

• amefika = he/she has arrived
• wamefika = they have arrived

Even though each noun is singular by itself, together they form a plural subject.

wamefika can be broken down like this:

• wa- = they
• -me- = perfect aspect, often like have
• -fika = arrive

So wamefika means they have arrived or they are here now after arriving.

Because Swahili usually builds this meaning inside the verb.

In English, you say:

• they have arrived

In Swahili, the idea of have is expressed by -me- inside the verb:

• wa-me-fika

This is very common in Swahili. Subject, tense/aspect, and the verb root are often combined into one word.

mlalamikaji means complainant or the person who makes the complaint.

It comes from the verb kulalamika, meaning to complain.

A useful pattern is:

• verb + -ji → person who does the action

So here:

• lalamika = complain
• lalamikaji = complainer / complainant
• m-lalamikaji = a complainant, one person

The m- marks it as a singular human noun.

mlalamikiwa means the person complained about or the person complained against. In a legal setting, this is often something like the respondent or the accused party, depending on context.

The ending -iwa is related to a passive or affected meaning. It helps give the sense of the one who has the action directed toward them.

So the contrast is:

• mlalamikaji = the one who complains
• mlalamikiwa = the one complained against

That pair is very typical of formal Swahili, especially in legal or administrative language.

They are both singular.

Here the sentence is talking about:

• one complainant
• one respondent / one person complained against

That is why the singular forms are used:

• mlalamikaji
• mlalamikiwa

If they were plural, you would usually get:

• walalamikaji = complainants
• walalamikiwa = people complained against

Even though the nouns here are singular, the whole subject is plural because it has two people joined by na.

kwa ajili ya means for, for the purpose of, or on account of.

So:

• kwa ajili ya usikilizaji = for the hearing

This is a very common fixed expression. It is a bit more explicit and formal than just using a simpler for-type wording.

You can think of it as introducing the purpose of their arrival.

usikilizaji is a noun formed from kusikiliza, which means to listen or to hear.

So:

• kusikiliza = to listen / hear
• usikilizaji = listening / hearing

In this sentence, the legal or official meaning is hearing, as in a court or tribunal hearing.

So although the basic idea is listening, in context it means an official hearing session.

Yes, it sounds formal and especially legal/administrative.

Words like these are a clue:

• mlalamikaji
• mlalamikiwa
• usikilizaji

They are not wrong in ordinary speech, but together they sound like the kind of language you would see in:

• court settings
• official announcements
• case records
• administrative procedures

A more casual everyday sentence would usually use simpler wording.

A helpful pronunciation guide is:

• mla-la-mi-KA-ji
• na
• mla-la-mi-KI-wa
• wa-me-FI-ka
• kwa a-JI-li ya
• u-si-ki-li-ZA-ji

A few useful pronunciation tips:

• Swahili vowels are usually pronounced clearly: a, e, i, o, u
• stress is usually on the second-to-last syllable
• most letters are pronounced consistently

So say it smoothly as:

Mla-la-mi-KA-ji na mla-la-mi-KI-wa wa-me-FI-ka kwa a-JI-li ya u-si-ki-li-ZA-ji.