Mtoto anahara leo, kwa hiyo anaenda kliniki.

It is one verb word made of several parts:

• a- = he/she (more exactly, the subject marker for a singular class 1 noun)
• -na- = present tense / ongoing action
• -hara = the verb stem from kuhara (to have diarrhea)

So anahara means he/she has diarrhea or he/she is having diarrhea.

Because Swahili usually packs the subject and tense into the verb itself.

• a- = he/she
• -na- = present tense
• -enda = go

So anaenda means he/she is going or he/she goes.

It is built into the verb. Swahili often does not need a separate word like English is.

For example:

• anahara = he/she has diarrhea / is having diarrhea
• anaenda = he/she is going

So the subject and the present tense are already included in the verb form.

Because mtoto belongs to noun class 1 in the singular, and class 1 singular subjects use the subject marker a- on the verb.

So:

• mtoto anaenda = the child is going

If it were plural, the agreement would change:

• watoto wanaenda = the children are going

This is an important Swahili pattern: the verb agrees with the noun class of the subject.

Kwa hiyo connects a cause and a result. In English, it often means:

• so
• therefore
• for that reason
• that is why

In this sentence, it links the child's condition with the next action.

After verbs like kwenda / kwenda (to go), Swahili often gives the destination directly without a separate word that exactly matches English to.

So:

• anaenda kliniki = he/she is going to the clinic

If you wanted to talk about being in/at the clinic, you would usually use a locative expression such as kwenye kliniki.

Yes. Leo (today) is fairly flexible.

These are all possible, with slightly different emphasis:

• Mtoto anahara leo.
• Leo mtoto anahara.
• Mtoto leo anahara.

The version in your sentence is very natural. Putting leo first gives a little more emphasis to today.

You would change both the noun and the verb agreement:

• Mtoto anahara leo, kwa hiyo anaenda kliniki.
• Watoto wanahara leo, kwa hiyo wanaenda kliniki.

Changes:

• mtoto → watoto (child → children)
• ana- → wana- (he/she is → they are)

So plural subjects need plural agreement on the verb.