Ég get útskýrt þetta einfaldast svona.

No. Here get is the 1st person singular present of geta, which means can / be able to.

So:

• Ég get = I can
• not I get

It just happens to look like the English word get.

After geta and other modal verbs, Icelandic normally uses the verb form called the supine (sagnbót), not the dictionary infinitive.

So:

• dictionary form: útskýra = to explain
• after get: útskýrt

That means Ég get útskýrt is the normal way to say I can explain.

This is different from English, where we use a bare infinitive: can explain.

Here þetta is the direct object of útskýrt, so it is in the accusative.

A useful detail: with this neuter form, nominative and accusative look the same:

• nominative neuter singular: þetta
• accusative neuter singular: þetta

So you know its role from the sentence structure, not from a different ending.

It is functioning adverbially here. It tells you how the speaker can explain it: most simply / in the simplest way.

So it is describing the action útskýrt, not the object þetta.

In other words, the idea is:

• not this is simplest
• but I can explain this most simply

It comes from the adjective einfaldur = simple.

Icelandic often uses adjective forms adverbially, especially the neuter singular forms. So you get a pattern like:

• einfalt = simply / in a simple way
• einfaldara = more simply
• einfaldast = most simply

So einfaldast is the superlative form being used adverbially.

Because einfaldast specifically means in the simplest way / most simply.

einfaldlega also means simply, but it often has a slightly different feel, more like:

• simply
• plainly
• sometimes even just

In this sentence, the speaker is talking about the simplest possible way to explain something, so einfaldast fits very well.

Svona means like this / this way / like so.

It points to the method or form of explanation. Very often it introduces or accompanies an explanation, demonstration, or example.

So:

• einfaldast = most simply
• svona = like this / this way

Together, the end of the sentence means something like most simply, like this.

Because Icelandic main clauses normally put the finite verb early in the sentence. Here that gives you:

• Ég = subject
• get = finite verb
• útskýrt = non-finite verb form
• þetta = object
• einfaldast svona = manner / way of explaining

This order is natural and neutral. Icelandic word order is somewhat flexible, but the given version sounds straightforward and idiomatic.

Sometimes yes, but the meaning or feel can change.

At the end, svona clearly means like this / this way:

• Ég get útskýrt þetta svona.

If you move svona earlier, especially in speech, it can start to sound more like sort of / kind of, depending on context.

So in this sentence, the final position is a good, clear place for the literal like this meaning.

No. Þetta very often refers to an idea, issue, topic, situation, or problem, not just a physical object.

So in a sentence like this, it can easily mean something like:

• this
• this matter
• it

That is very common in Icelandic.

A good learner approximation is THET-ta.

A few helpful details:

• þ sounds like th in thing
• the e is like e in bet
• the double tt is not exactly like English tt; many speakers pronounce it with a little h-like puff before the t, so you may hear something closer to THEH-ta

You do not need to perfect that immediately, but it is a very common Icelandic sound pattern.