La frustración baja cuando divido el trabajo en pasos pequeños.

In Spanish, abstract nouns often take the definite article more often than in English.

So la frustración is completely natural here, even though in English we would usually just say frustration without the.

• La frustración baja... = Frustration goes down...

You could sometimes omit the article in other contexts, but in this sentence la frustración sounds very normal and idiomatic.

Baja is the third-person singular present form of the verb bajar.

Here, la frustración is the subject, so the verb has to match it:

• la frustración baja = frustration goes down / decreases

Conjugation of bajar in the present:

• yo bajo
• tú bajas
• él/ella/usted baja
• nosotros bajamos
• vosotros bajáis
• ellos/ellas/ustedes bajan

Since frustración is like it, Spanish uses baja.

Because bajar can be used both:

1. Intransitively: something goes down by itself

   • La temperatura baja. = The temperature goes down.

2. Transitively: someone lowers something

   • Bajo el volumen. = I lower the volume.

In your sentence, la frustración is the thing changing, so baja means decreases / goes down.

Because the sentence is talking about a change or reduction, not describing frustration as low.

Compare:

• La frustración baja = Frustration goes down / decreases
• La frustración es baja = Frustration is low
• La frustración está baja = less natural here; it sounds more like describing a current level

So baja here is a verb, not an adjective.

Spanish often uses the present tense for things that happen regularly, generally, or whenever a condition occurs.

So:

• cuando divido el trabajo en pasos pequeños = when I divide the work into small steps

This means whenever I do that, frustration goes down.

Other tenses would change the meaning:

• cuando dividí... = when I divided... (specific past event)
• cuando dividiré... = not natural here; Spanish usually does not use the future after cuando when referring to a future event in this way

Divido is the first-person singular present form of dividir.

Conjugation:

• yo divido
• tú divides
• él/ella/usted divide
• nosotros dividimos
• vosotros dividís
• ellos/ellas/ustedes dividen

Since the sentence means I divide, you need divido.

Cuando means when, and here it expresses a repeated situation:

• La frustración baja cuando divido el trabajo...
• Frustration decreases when I divide the work...

You could use si in some contexts, but it would mean if:

• La frustración baja si divido el trabajo... = Frustration decreases if I divide the work...

That is also possible, but it sounds a bit more conditional. Cuando suggests this is something that regularly happens.

Trabajo is a masculine noun, so it takes el:

• el trabajo = the work / the task / the workload

It can refer to:

• work in general
• a task
• an assignment
• a piece of work

In this sentence, it means the work you need to do.

Because dividir algo en is the normal pattern in Spanish.

• dividir algo en partes
• dividir algo en grupos
• dividir algo en pasos pequeños

So:

• dividir el trabajo en pasos pequeños = to divide the work into small steps

The preposition en here corresponds to English into.

In Spanish, most descriptive adjectives usually come after the noun.

So:

• pasos pequeños = small steps

This is the normal order.

You may sometimes see adjectives before nouns, but that often adds emphasis or a more subjective tone. Here, pasos pequeños is the straightforward, neutral choice.

Because adjectives must agree with the noun in gender and number.

• paso is masculine
• plural: pasos
• so the adjective must also be masculine plural: pequeños

Agreement:

• paso pequeño = small step
• pasos pequeños = small steps
• parte pequeña = small part
• partes pequeñas = small parts

Yes, but the nuance changes.

• pasos pequeños = small steps
  This is very common when talking about breaking a process into manageable actions.

• partes pequeñas = small parts
  This sounds more like dividing something into sections or pieces.

If the idea is productivity, planning, or making a task less overwhelming, pasos pequeños is usually the most natural choice.

Both are natural, but they focus on different things.

• La frustración baja = Frustration decreases
  This sounds a bit more general or abstract.

• Me frustro menos = I get less frustrated
  This is more personal and direct.

So if you want to keep the idea abstract, the original sentence works well. If you want a more everyday personal version, me frustro menos cuando divido el trabajo en pasos pequeños is also very natural.

Not usually in this context.

• trozos means pieces/chunks, often of something physical or conceptual in a more literal way
• pasos means steps, which fits a process or task much better

So:

• dividir el trabajo en pasos pequeños = natural for planning or productivity
• dividir el trabajo en trozos pequeños = understandable, but less natural here

A good alternative would be:

• dividir el trabajo en pequeñas partes
• dividir el trabajo en tareas pequeñas
• dividir el trabajo en pasos pequeños

This sentence is standard and natural in both Spain and Latin America.

Nothing in it is strongly regional. A speaker from Spain would understand and use it naturally, and so would speakers from many other Spanish-speaking countries.

If you are learning Spanish from Spain, this sentence is perfectly fine as-is.

Yes. Spanish word order is flexible, although some versions sound more neutral than others.

Original:

• La frustración baja cuando divido el trabajo en pasos pequeños.

Also possible:

• Cuando divido el trabajo en pasos pequeños, la frustración baja.

Both mean the same thing. The second version puts more emphasis on the when I divide the work... part first.

The original sounds very natural and balanced.