Новая грамматическая тема: конструкция «даже если» помогает сказать, что результат не меняется.

Даже если means even if.

It introduces a condition, but the speaker is saying that this condition does not change the final result.

For example:

Даже если будет дождь, мы пойдём гулять.
= Even if it rains, we will go for a walk.

So the key idea is: the outcome stays the same.

Если just means if and gives a normal condition.

Даже если means even if and adds the idea that the result remains the same in spite of that condition.

Compare:

Если будет дождь, мы останемся дома.
= If it rains, we will stay home.

Даже если будет дождь, мы пойдём гулять.
= Even if it rains, we will go for a walk.

In the second sentence, the rain does not change the plan.

Because they both describe тема, and тема is:

• feminine
• singular
• nominative

Russian adjectives must agree with the noun they describe in gender, number, and case.

So:

• новая тема = new topic
• грамматическая тема = grammar topic / grammatical topic

Both adjectives take the feminine singular nominative ending -ая to match тема.

The colon works much like it does in English: it introduces an explanation or the content of the topic.

So this sentence is structured like:

New grammar topic: ...

In other words, Новая грамматическая тема is like a heading, and everything after the colon explains what that topic is.

After помогать or помочь, Russian often uses an infinitive to show what someone or something helps you do.

So:

• помогает = helps
• сказать = to say

Together:

помогает сказать = helps say / helps express

In more natural English here, you might translate it as:

The construction даже если helps express that the result does not change.

Что means that and introduces a content clause.

So:

• сказать = to say
• что результат не меняется = that the result does not change

This is very similar to English say that...

English sometimes leaves out that, but Russian usually keeps что in this kind of sentence.

Because результат is the subject of the clause результат не меняется.

In that clause:

• результат = the result
• не меняется = does not change

The subject of a Russian sentence is normally in the nominative case, so результат stays nominative.

Because меняться and менять are different verbs.

• менять = to change something
• меняться = to change, to be changing, to change itself

Here, the meaning is that the result itself does not change, so Russian uses меняться:

результат не меняется
= the result does not change

If you said не меняет, there would usually need to be a direct object:

Он не меняет план.
= He is not changing the plan.

Because the sentence is giving a general rule or definition, not describing one specific event.

Russian often uses the present tense for general truths, explanations, and definitions.

So here:

конструкция ... помогает сказать, что результат не меняется

means something like:

This construction is used to show that the result stays the same.

It is a general statement about how the grammar works.

Даже если introduces a subordinate clause, so you normally separate that clause from the main clause with a comma.

If the даже если clause comes first:

Даже если он придёт, я не уйду.
= Even if he comes, I will not leave.

If it comes second:

Я не уйду, даже если он придёт.
= I will not leave, even if he comes.

Important: there is no comma inside даже если itself. The comma separates the clauses, not даже from если.