Strømmepakken koster mer etter introduksjonstilbudet.

Norwegian very often combines nouns into one compound word. Here, strømmepakken is the definite singular form of strømmepakke.

The last part of a compound is the main noun:

• pakke = package
• strømmepakke = streaming package
• strømmepakken = the streaming package

Because pakke is a common-gender noun (en pakke), the definite singular becomes pakken inside the compound.

In Norwegian, the is usually built into the noun as an ending.

Examples:

• pakke = a package
• pakken = the package
• tilbud = an offer
• tilbudet = the offer

So both strømmepakken and introduksjonstilbudet already include the idea of the.

A separate word like den/det is usually added in special cases, especially with adjectives:

• det nye tilbudet = the new offer

Both are possible, but koster mer is especially natural when talking about price.

• koster mer = costs more
• er dyrere = is more expensive

With subscriptions, plans, and products, Norwegian often uses koste when the focus is on what the customer pays.

Use mer for amount, degree, or price. Use flere for countable things in the plural.

• Det koster mer. = It costs more.
• Jeg har flere bøker. = I have more books.

Since this sentence is about price, mer is the correct word.

Here etter means after in a time sense.

So etter introduksjonstilbudet means something like:

• after the introductory offer
• after the introductory offer ends
• once the introductory offer period is over

Norwegian often leaves ends / is over unspoken because it is understood from context.

Not in this sentence.

You use enn when the comparison is stated explicitly:

• koster mer enn før = costs more than before
• koster mer enn under introduksjonstilbudet = costs more than during the introductory offer

In Strømmepakken koster mer etter introduksjonstilbudet, the comparison is understood, so enn is not needed.

Because Norwegian normally writes compound nouns as one word.

So:

• introduksjon + tilbud = introduksjonstilbud
• introduksjonstilbudet = the introductory offer

The last part, tilbud, is the main noun. Since tilbud is a neuter noun (et tilbud), the definite form is tilbudet.

Yes, but remember the verb-second rule in main clauses.

The original sentence:

• Strømmepakken koster mer etter introduksjonstilbudet.

You can also put the time phrase first:

• Etter introduksjonstilbudet koster strømmepakken mer.

That is also correct. When a different element comes first, the verb still stays in second position, so the subject moves after the verb.