Tutashauriana isipokuwa kipima muda kiharibike.

Tutashauriana can be broken down like this:

• tu- = we
• -ta- = future marker, will
• -shauri- = advise / consult / discuss
• -an- = reciprocal, each other / one another
• -a = the usual final vowel

So tutashauriana means we will consult each other, we will discuss together, or we will confer.

The -an- is the reciprocal extension. It shows that the action is done to each other.

So compare:

• kushauri = to advise, counsel
• kushauriana = to consult each other, discuss together

Without -an-, the meaning would not include that idea of mutual action.

Here isipokuwa means unless.

It can also mean except or except for in other contexts, but in this sentence it introduces an exception clause:

• Tutashauriana = we will consult each other
• isipokuwa ... = unless ...

So the whole structure is basically:

We will do X, unless Y happens.

Kiharibike is in the subjunctive form, and that fits well after isipokuwa when talking about a possible event:

• ki- = subject marker agreeing with kipima muda
• haribik- = become broken / get damaged
• -e = subjunctive ending

So kipima muda kiharibike means something like unless the timer should break or unless the timer breaks.

If you said kitaharibika, that would be a plain future form: it will break. That sounds more like a prediction than a contingency. After isipokuwa, the subjunctive often sounds more natural because the event is uncertain and conditional.

This is a very useful distinction:

• haribu = to spoil / damage / break something
  This is transitive: someone does it to something.
• haribika = to get spoiled / become damaged / break
  This is intransitive: the thing itself ends up broken.

So in this sentence:

• kiharibike comes from haribika
• it means the timer breaks / becomes damaged
• it does not mean someone breaks the timer

If you wanted to say unless someone breaks the timer, the structure would be different.

Because kipima muda belongs to the ki-/vi- noun class, which is class 7 in the singular.

So the verb must agree with that noun:

• kipima muda = singular, class 7
• subject agreement = ki-

That is why you get:

• kipima muda kiharibike

If it were plural, for example vipima muda, the agreement would change to vi-.

Kipima muda is a noun meaning something like timer, time-measuring device, or sometimes stopwatch, depending on context.

It is built from the idea of:

• -pima = measure
• muda = time

So literally it is something like a thing that measures time.

A learner might notice that it looks like more than one word, but it functions together as one noun expression.

Kimeharibika is a different form. It usually means it has broken or it is broken.

Compare:

• kiharibike = if it breaks / should it break / unless it breaks
• kimeharibika = it has broken / it is already broken

So the sentence uses kiharibike because it is talking about a possible future problem, not a completed state.

Yes. This is a normal and natural order:

• main clause first: Tutashauriana
• exception clause after it: isipokuwa kipima muda kiharibike

So the pattern is:

We will consult each other, unless the timer breaks.

You could rearrange things for emphasis in some contexts, but the given order is straightforward and natural for learners to recognize.