Esa metáfora no me resultó difícil, porque la profesora explicó el verso con calma.

It means something like I didn’t find it difficult or it didn’t seem difficult to me.

The verb resultar often expresses how something turned out or came across from someone’s point of view.

So:

• Me resultó difícil = I found it difficult
• No me resultó difícil = I didn’t find it difficult

It is a very natural Spanish way to talk about your experience of something.

Me is the indirect object pronoun meaning to me.

Spanish often uses this pattern:

• resultar + adjective + a alguien
• or with a pronoun: me, te, le, nos, os, les

So:

• Esa metáfora no me resultó difícil = That metaphor was not difficult to me / I didn’t find that metaphor difficult

English often leaves out to me, but Spanish usually includes it.

Compare:

• No me resultó difícil = I didn’t find it difficult
• No resultó difícil = It didn’t turn out difficult in a more general sense, without saying for whom

Because the speaker is talking about a completed past experience.

Resultó is the preterite of resultar, and it fits well when you mean:

• at that moment
• in that situation
• on that occasion

So no me resultó difícil means that, in that particular case, it turned out not to be difficult.

If you used the imperfect:

• no me resultaba difícil

it would sound more like a repeated or ongoing past situation, such as it wasn’t difficult for me at the time / generally speaking.

Both are possible, but they are not exactly the same.

• No me resultó difícil = I didn’t find it difficult / It didn’t turn out difficult for me
• No fue difícil para mí = It wasn’t difficult for me

Resultar sounds a bit more tied to the speaker’s personal impression or experience. It is often very natural when you are evaluating how hard or easy something felt.

So in this sentence, resultó is a very good choice.

Esa means that, and it agrees with metáfora, which is feminine singular.

Spanish demonstratives must agree with the noun:

• este libro
• esta metáfora
• ese verso
• esa metáfora

The difference between esta and esa is about distance or reference:

• esta = this
• esa = that

In many contexts, esa refers to something already mentioned or something a little less immediate than esta.

Because difícil is an adjective that does not change for gender.

So you say:

• un libro difícil
• una metáfora difícil

The form stays difícil for both masculine and feminine.

It only changes for number:

• un libro difícil
• dos libros difíciles
• una metáfora difícil
• dos metáforas difíciles

Here verso usually means a line of poetry or a verse.

It does not mean the whole poem.

Useful distinctions:

• verso = a line of poetry / a verse
• poema = poem
• estrofa = stanza

So la profesora explicó el verso means the teacher explained that particular poetic line.

Con calma literally means with calm, but in natural English it usually means:

• calmly
• slowly
• without rushing
• carefully

So:

• explicó el verso con calma = she explained the verse calmly / carefully / without rushing

It is a very common phrase in Spanish.

Examples:

• Léelo con calma = Read it carefully / Take your time reading it
• Vamos con calma = Let’s go slowly / Let’s take it easy

Because profesora is the feminine form of profesor.

• el profesor = the male teacher
• la profesora = the female teacher

In this sentence, the teacher is female, so Spanish uses la profesora.

Also, Spanish normally uses the article with a specific person in this kind of sentence:

• La profesora explicó el verso
• El profesor corrigió el examen

Yes. That is also correct.

Spanish word order is more flexible than English word order. Both of these are natural:

• La profesora explicó el verso con calma
• La profesora explicó con calma el verso

The first one keeps el verso close to the verb explicó, which is very common.

The second one puts slightly more attention on how she explained it: con calma.

So the original sentence is normal, but it is not the only possible order.

That is a very good question, because in many cases Spanish does not use a comma before porque.

A version without the comma is also very natural:

• Esa metáfora no me resultó difícil porque la profesora explicó el verso con calma.

With the comma, the second part sounds a bit more explanatory, almost like:

• That metaphor didn’t seem difficult to me, and the reason is that the teacher explained the verse calmly.

So the comma adds a slight pause and a more explanatory tone. In plain neutral writing, many people would simply leave it out.

Yes, but it is a slightly different structure.

You can say:

• Esa metáfora no fue difícil para mí
• Esa metáfora no me resultó difícil

Both are correct, but no me resultó difícil is often more idiomatic in Spanish for expressing personal experience.

Using para mí is more direct and explicit, while me with resultar sounds very natural and elegant.

Because el verso is not a person.

The personal a is usually used before a specific human direct object:

• Vi a la profesora
• Escuché a mi amigo

But here the direct object is el verso, which is a thing, so there is no a:

• La profesora explicó el verso

That is exactly what you would expect.

Yes. Porque is correct here because it means because.

These three forms are different:

• porque = because
• por qué = why / for what reason
• el porqué = the reason

So in this sentence:

• ..., porque la profesora explicó el verso con calma.

the meaning is because the teacher explained the verse calmly, so porque is the correct spelling.