Nilipofika nyumbani, sikuwa nimechoka sana, kwa hiyo nilianza kusafisha sebule kabla ya wageni kufika.

Nilipofika means when I arrived.

It can be broken down like this:

• ni- = I
• -li- = past tense
• -po- = a marker often used here for when
• fika = arrive

So nilipofika literally works like when I arrived or upon arriving.

This -po- pattern is very common in time clauses:

• nilipoona = when I saw
• uliposikia = when you heard
• walipofika = when they arrived

Nyumba means house/home as a noun.

Nyumbani is a locative form, meaning something like:

• at home
• to the house
• home

The ending -ni often adds a location idea in Swahili.

So:

• nyumba = house
• nyumbani = at home / home

That is why Nilipofika nyumbani means when I arrived home or when I got home.

In Swahili, locative forms like nyumbani often already contain the idea of location or destination, so a separate preposition is usually not needed.

English says:

• arrive home
• arrive at home
• go to the house

Swahili can simply say:

• kufika nyumbani = arrive home
• kwenda nyumbani = go home

So nyumbani itself is doing a lot of the work that English often does with prepositions.

This is a very common learner question.

Sikuwa nimechoka sana literally combines:

• sikuwa = I was not
• nimechoka = become tired / am tired

Together, it gives the idea I was not very tired or I had not gotten very tired.

Why not sikuchoka?

• sikuchoka means I did not get tired or I was not tired in a simpler verbal sense.
• sikuwa nimechoka emphasizes the state I was in at that time.

So in this sentence, sikuwa nimechoka sana sounds natural because the speaker is describing their condition when they got home.

It can mean both, depending on context.

Nimechoka is built from the perfect form and often suggests:

• I am tired
• I have become tired
• I have gotten tired

In Swahili, this form often connects a completed change with a present state.

So:

• nimechoka = I’m tired / I have become tired
• sikuwa nimechoka sana = I wasn’t very tired / I hadn’t gotten very tired

This is one reason Swahili and English do not always match word-for-word.

Kwa hiyo means:

• so
• therefore
• for that reason
• as a result

In this sentence, it connects the two ideas:

• I wasn’t very tired
• so I started cleaning the living room

It is very common and natural. It is not especially stiff or unnatural, though in very casual speech people may also use other connectors depending on region and style.

After verbs like kuanza (to begin/start), Swahili commonly uses another verb in the infinitive form.

So:

• nilianza = I started
• kusafisha = to clean

Together:

• nilianza kusafisha = I started to clean / I began cleaning

This is very similar to English:

• I started to clean
• I began cleaning

Other examples:

• alianza kusoma = he/she started to read
• tulianza kufanya kazi = we started to work

Both ideas are useful.

The verb kusafisha means to clean. It comes from a causative formation related to being clean, so the deeper sense is something like to make clean.

For a learner, the most practical translation is simply:

• kusafisha = to clean

So:

• nilianza kusafisha sebule = I started cleaning the living room

Sebule means living room or sitting room.

It is a common household word in Swahili. So:

• kusafisha sebule = to clean the living room

In Swahili, sana usually comes after the word it modifies.

So:

• nimechoka sana = very tired
• nzuri sana = very good
• anapenda sana = he/she likes it very much

English often puts very before an adjective, but Swahili usually puts sana after.

This means before the guests arrived or before the guests came/arrived.

Breakdown:

• kabla ya = before
• wageni = guests
• kufika = arriving / to arrive

A useful way to understand it is:

• kabla ya wageni kufika = before the guests’ arriving

Swahili often uses the infinitive/verbal noun kufika after expressions like kabla ya.

Because after kabla ya, Swahili often uses a noun or a verbal-noun-type structure rather than a fully finite clause.

So wageni kufika works like:

• the guests arriving
• the arrival of the guests

That is why kufika stays in the infinitive form.

A learner may also later meet another common pattern such as:

• kabla wageni hawajafika

which also means before the guests arrive / before the guests have arrived.

Both patterns are useful, but the one in your sentence is completely normal.

The singular is mgeni = guest.

The plural is wageni = guests.

This is a noun class pair:

• m- / wa-

So:

• mgeni = guest
• wageni = guests

This noun class is very common for people:

• mtoto / watoto = child / children
• mwalimu / walimu = teacher / teachers
• mtu / watu = person / people

Yes. The sentence is built very logically in three parts:

1. Nilipofika nyumbani
   = when I got home

2. sikuwa nimechoka sana
   = I wasn’t very tired

3. kwa hiyo nilianza kusafisha sebule kabla ya wageni kufika
   = so I started cleaning the living room before the guests arrived

So the flow is:

• time background
• speaker’s condition
• resulting action

This kind of structure is very common in Swahili narrative style.