Me resulta fácil comprender el texto cuando la profesora lo explica con calma.

Both are possible, but me resulta fácil is a very natural way to say I find it easy or it is easy for me.

The pattern is:

[indirect object pronoun] + resultar + adjective + infinitive

So:

Me resulta fácil comprender...
= I find it easy to understand...

Compared with es fácil para mí, me resulta fácil often sounds a bit more idiomatic and personal in this kind of sentence.

Me is an indirect object pronoun, meaning to me or for me.

So:

Me resulta fácil...
literally means something like
...is easy for me

If you wanted extra emphasis, you could say:

A mí me resulta fácil...

But the a mí is optional here.

Because the thing that is easy is not I. The subject is the whole action:

comprender el texto cuando la profesora lo explica con calma

That whole infinitive phrase functions as the subject, and Spanish normally uses third person singular with that kind of subject:

Me resulta fácil nadar.
Me resulta difícil concentrarme.

So resulta agrees with the idea understanding the text..., not with me.

Because after expressions like es fácil, resulta difícil, parece imposible, Spanish usually uses an infinitive to name the action.

So:

Me resulta fácil comprender el texto
= It is easy for me to understand the text

If you said comprendo, you would need a different structure, for example:

Comprendo el texto fácilmente cuando la profesora lo explica con calma.

That means roughly the same thing, but the grammar is different.

Usually they mean almost the same thing: to understand.

A rough tendency is:

• entender = more common in everyday speech
• comprender = sometimes sounds a bit more formal, or can suggest fuller understanding

In this sentence, both would work:

Me resulta fácil comprender el texto...
Me resulta fácil entender el texto...

The original just sounds slightly more formal or academic.

Spanish uses the definite article el / la / los / las more often than English does.

Here el texto refers to a specific text that both speaker and listener can identify, so Spanish naturally uses the article:

comprender el texto

Even where English might sometimes say understand text in a general way, Spanish usually prefers an article with countable nouns like this.

Lo refers back to el texto.

Since texto is:

• masculine
• singular
• a direct object

the correct pronoun is lo.

So:

la profesora lo explica
= the teacher explains it

It cannot be la, because texto is not feminine.

Because in Spanish, object pronouns like lo, la, los, las, me, te normally go before a conjugated verb.

So:

la profesora lo explica

not
la profesora explica lo

You can attach object pronouns to:

• an infinitive: explicarlo
• a gerund: explicándolo
• an affirmative command: explícalo

But with a normal conjugated form like explica, the pronoun goes before it.

Because this sentence describes a habitual or general situation.

With cuando, Spanish uses:

• indicative for habitual, repeated, or factual actions
• subjunctive for future or not-yet-realised actions

Here it means something like when/whenever the teacher explains it calmly, as a repeated situation, so explica is correct.

Compare:

Me resulta fácil comprender el texto cuando la profesora lo explica con calma.
= a general/habitual fact

Me resultará fácil comprender el texto cuando la profesora lo explique mañana.
= a future event, so subjunctive

In this sentence, it can feel like either when or whenever in English.

Because the sentence describes a repeated situation, English often understands it as:

when/whenever the teacher explains it calmly

So cuando here is not just one single moment in time. It has a general, repeated meaning.

Con calma means something like:

• calmly
• slowly
• without rushing
• in a relaxed way

In this sentence, it suggests that the teacher explains the text in a clear, unhurried way.

It is a very common expression. Spanish often prefers con calma over a more formal adverb like calmadamente.

Yes. That is grammatically correct.

For example:

Para mí es fácil comprender el texto cuando la profesora lo explica con calma.

It means the same basic thing, but the style is a little different.

Very roughly:

• Me resulta fácil... = more natural and idiomatic in many contexts
• Para mí es fácil... = also correct, a bit more direct or explicit

Yes, but it adds emphasis.

Compare:

• Me resulta fácil comprender el texto... = neutral
• A mí me resulta fácil comprender el texto... = for me, specifically, it is easy

You might use a mí if you are contrasting yourself with someone else:

A mí me resulta fácil, pero a mi hermano no.

Yes, Spanish allows some flexibility.

For example, you could also say:

Me resulta fácil comprender el texto cuando lo explica la profesora con calma.

That is still correct. The original version is very natural and clear, though.

What usually does not change is the position of the clitic pronoun lo relative to the conjugated verb:

lo explica is the normal pattern.