Shemeji yangu ni mwanachama mpya, kwa hiyo anajifunza jinsi kampeni inavyopangwa.

Shemeji is a family-relationship word often translated as brother-in-law, sister-in-law, or more generally in-law. It is broader than any one English term, so the exact relationship depends on context.

In this sentence, shemeji yangu means my in-law.

In Swahili, possessives usually come after the noun, not before it.

So:

• shemeji yangu = my in-law
• literally, it is more like in-law my

This is normal Swahili word order.

Swahili possessives change to agree with the noun class of the noun they describe.

The possessive stem for my is -angu, but it gets a class agreement prefix.
With shemeji, the form used is yangu.

For example:

• shemeji yangu = my in-law
• shemeji zangu = my in-laws

So yangu is not a completely separate word from -angu; it is the noun-class-agreeing form.

Here, ni is the equivalent of is / am / are in an equational sentence.

So:

• shemeji yangu ni mwanachama mpya = my in-law is a new member

Swahili often uses ni to connect two nouns or noun phrases:

• Mimi ni mwalimu = I am a teacher
• Yeye ni rafiki yangu = He/she is my friend

Swahili does not usually use articles like English a, an, or the.

So:

• mwanachama mpya can mean a new member or the new member, depending on context

In this sentence, English naturally translates it as a new member, but Swahili does not need a separate word for that.

Mwanachama means member. It belongs to the m-/wa- noun class for people.

That means:

• singular: mwanachama = member
• plural: wanachama = members

This is useful because other words around it will agree with that noun class.

Adjectives in Swahili agree with the noun class of the noun they describe.

Since mwanachama is singular and belongs to the m-/wa- class, -pya takes the agreement prefix m-, giving:

• mwanachama mpya = new member

Compare:

• wanachama wapya = new members

So the adjective changes to match the noun.

Kwa hiyo means so, therefore, or for that reason.

It connects the first idea to the second:

• Shemeji yangu ni mwanachama mpya, kwa hiyo...
• My in-law is a new member, so...

It shows cause and result.

Anajifunza can be broken down like this:

• a- = he/she
• -na- = present tense
• -jifunza = learn

So anajifunza means he/she is learning.

A helpful detail: -jifunza comes from the idea of learning oneself, related to -funza (teach).

Compare:

• anafundisha = he/she teaches
• anajifunza = he/she learns

Jinsi means how, the way, or the manner in which.

In this sentence:

• anajifunza jinsi kampeni inavyopangwa
• he/she is learning how the campaign is organized

So jinsi introduces the clause explaining the method or manner.

You can think of it as:

• jinsi ... = how ... / the way that ...

This is one of the more advanced parts of the sentence.

Inavyopangwa can be broken down like this:

• i- = subject marker for kampeni
• -na- = present/general tense
• -vyo- = relative marker used in this kind of how/the way clause
• -pangwa = be planned / be arranged

So:

• jinsi kampeni inavyopangwa = how the campaign is planned / organized

The whole phrase means something like the way the campaign is organized.

Kampeni is a borrowed noun, and in Swahili it behaves like a noun in the N-class.
With many singular nouns in this class, the subject marker is i-.

So:

• kampeni inavyopangwa = the campaign is organized / how the campaign is organized

If it were treated as plural in agreement, you would often see zi- instead:

• kampeni zinavyopangwa = how campaigns are organized

This is why the agreement marker is i- here.

Yes. -pangwa is the passive form of -panga.

• -panga = arrange, organize, plan
• -pangwa = be arranged, be organized, be planned

So:

• Wana panga kampeni = They are organizing the campaign
• Kampeni inapangwa = The campaign is being organized

In your sentence, the passive is used because the focus is on the campaign and how it is organized, not on who is doing the organizing.

It can suggest either one, depending on context.

In a sentence with jinsi, it often has a more general meaning:

• how it is organized
• how it is planned
• the way it gets organized

So the translation does not have to be strictly progressive in English. The point is the process or method, not just the exact tense.

Yes. Swahili usually does not mark gender in verbs or pronouns the way English does.

So anajifunza can mean:

• he is learning
• she is learning

The same is true for the earlier part of the sentence. You need context to know whether the person is male or female.