Ni muhimu watoto wasikaribie toroli lililojaa tofali na nondo.

Ni muhimu means It is important.

• ni = is / it is
• muhimu = important

So the sentence begins by giving an opinion or warning: something is important.

Swahili normally does not use articles like the or a/an.

So watoto can mean:

• children
• the children
• sometimes even some children

The exact meaning depends on context. In this sentence, English often translates it simply as children or the children.

Because after expressions like Ni muhimu, Swahili often uses the subjunctive to show what should or should not happen.

So:

• wasikaribie = that they should not approach / that they must not go near
• hawakaribii = they do not approach / they are not approaching

In other words:

• wasikaribie is about a warning, instruction, or desired outcome
• hawakaribii is just a statement of fact

It breaks down like this:

• wa- = they
• -si- = negative marker used in this kind of form
• karibi- = verb root from karibia, meaning approach / come near
• -e = subjunctive ending

So wasikaribie literally means something like that they not approach.

It can mean both, depending on context.

In this sentence, wasikaribie toroli means:

• they should not approach the wheelbarrow
• they should not go near the wheelbarrow

Both are good natural translations.

Toroli means wheelbarrow or sometimes handcart, depending on the situation and regional usage.

Here, because it is carrying building materials, wheelbarrow is a very natural translation.

Because lililojaa has to agree with toroli in noun class.

In Swahili, nouns belong to classes, and words that describe them often change form to match. Toroli is treated here as a singular noun that takes li- / -lo- agreement.

So:

• toroli lililojaa = the wheelbarrow that is full / loaded

A learner does not need to memorize every detail immediately, but the main idea is:

• lililojaa matches toroli
• it describes the wheelbarrow

Lililojaa means that is full, that is loaded, or that is filled.

So:

• toroli lililojaa tofali na nondo = a wheelbarrow that is full of bricks and metal rods

It functions like a relative clause in English:

• the wheelbarrow that is full of ...

Because Swahili does not always need a separate word matching English of in this kind of expression.

The verb kujaa means to be full / to be full of / to be filled with, so the thing filling it can follow directly.

So lililojaa tofali na nondo naturally means:

• full of bricks and metal rods
• loaded with bricks and metal rods

In this context:

• tofali = bricks
• nondo = metal rods / rebar

So the sentence is talking about a wheelbarrow loaded with construction materials.

Yes. That is a very natural way to translate it.

Because of Ni muhimu plus the negative subjunctive wasikaribie, the sentence has the sense of:

• It is important that children do not go near...
• Children should not go near...
• Children must not go near... in a strong warning context

The exact English wording can vary, but the core meaning stays the same.