O facto é simples.

In European Portuguese, facto is the normal word for fact.

This is a very important Portugal/Brazil difference:

• facto = fact in Portugal
• fato = suit / outfit in Portugal

So in Portugal, O facto é simples. is correct for The fact is simple.

If you say O fato é simples. in Portugal, many people will understand it as The suit is simple.

In Brazilian Portuguese, fato is the usual spelling for fact, so this is one of those differences learners should watch out for.

O is the definite article, meaning the.

So:

• o facto = the fact

Portuguese usually uses articles more often than English does. In this sentence, the noun is presented as a specific thing already identified in context, so o is natural.

Also, facto is a masculine singular noun, so the article must be o:

• o for masculine singular
• a for feminine singular

É is the 3rd person singular present form of the verb ser (to be).

So here:

• o facto = subject
• é = is
• simples = adjective

A very useful point: the accent matters.

• é = is
• e = and

So the accent is not optional here. It changes the word completely.

Portuguese has two main verbs for to be: ser and estar.

Here we use ser because simples is being presented as a characteristic or essential description of the fact.

• O facto é simples. = the fact is simple

Using estar would usually suggest a temporary state or condition, and with facto it would sound unusual in most normal contexts.

So this is a classic ser situation: describing what something is, not how it temporarily is.

Simples is one of those adjectives that often keeps the same form across masculine and feminine.

So you get:

• o facto é simples
• a ideia é simples

The adjective does not change here for gender.

It is also useful to know that simples is spelled the same in singular and plural:

• o facto é simples
• os factos são simples

So simples is a very convenient adjective: its form stays the same.

Facto is a masculine noun.

That affects:

• the article: o facto
• any words that would agree with it

In this sentence, simples does not visibly change, so the gender is only obvious from o.

If the noun were feminine, you would change the article:

• a situação é simples

So yes, gender matters here, even if the adjective itself does not show a different masculine/feminine form.

A rough European Portuguese pronunciation is:

u FAK-tu eh SIM-plsh

More carefully:

• O is often pronounced like u
• facto is roughly FAK-too, with the c pronounced
• é is an open eh
• simples in European Portuguese often ends with a sound like plsh

A more technical approximation would be something like:

/u ˈfaktu ɛ ˈsĩplɨʃ/

A few important pronunciation notes for Portugal:

• the c in facto is pronounced
• the final -s in simples sounds like sh
• unstressed vowels are often reduced

Not in normal standard Portuguese.

Portuguese generally wants the article here, so O facto é simples is the natural sentence.

Leaving out o would sound incomplete or very unnatural in ordinary usage.

So for a learner, the safe choice is:

• O facto é simples.

not

• Facto é simples.

Yes, but the given order is the most neutral and natural one.

• O facto é simples. = normal, straightforward word order

You can rearrange things in special contexts for emphasis, but that is less common and often more literary or rhetorical.

Also, be careful with a different structure like:

• o simples facto

That means the simple fact, which is a different construction. There, simples is directly modifying the noun inside the noun phrase.

So:

• O facto é simples. = the fact is simple
• O simples facto... = the simple fact...

These are related, but not the same structure.

It sounds neutral to slightly formal.

The noun facto is a standard, educated, completely normal word in Portugal. The whole sentence sounds clear and direct, and you could see it in:

• conversation
• writing
• news
• essays
• explanations

It is not slangy, and it is not especially casual. It is just solid standard Portuguese.