Well, you have three parts in this sentence: the subject lovene, the verb ændredes, and an adverbial construction indicating a timeframe for et år siden.
Usually you would go subject-verb-(object)-adverbials, like in standard English sentences: "Lovene ændredes for et år siden." But if you want to emphasise a certain aspect of the sentence, you can put that in the front. In that case, the verb has to come right after that aspect, and then the subject follows. And the rest behind. Let's look at a slightly longer example:
- Jeg gav en bold til min hund i går. - I gave a ball to my dog yesterday.
- En bold gav jeg til min hund i går. - I gave a ball to my dog yesterday.
- Til min hund gav jeg en bold i går. - I gave a ball to my dog yesrtday.
- I går gav jeg en bold til min hund. - Yesterday I gave a ball to my dog.
You see, each part of the sentence can be in the front, emphasising an aspect, but the verb has to come right after that.
I cannot hear the plural ending of "lov" here, even in the slow turtle version. Is there anything that distinguishes the pronunciation of "loven" and "lovene" in normal spoken language? Is maybe the schwa sound in the singular stronger (low-en), whereas in the plural, the "n" (followed by a ghosted "e") is pronounced stronger (lown)?