Learn Finnish: Bändistä tuli ilmiömäinen menestys, koska jokainen jäsen on lahjakas. - The band became a phenomenal success because every member is talented.

In Finnish, when you express what someone or something becomes (a change of state), you use the verb tulla and put the original subject in the elative case (-sta or -stä). So, bändistä tuli literally translates closer to 'from the band came'. The thing they became (ilmiömäinen menestys) stays in the nominative case.

How is the word ilmiömäinen (phenomenal) formed?

It comes from the noun ilmiö (phenomenon). The suffix -mäinen or -mainen is attached to nouns to create adjectives meaning 'like' or 'having the quality of' the root word, much like '-like' or '-al' in English. Therefore, ilmiömäinen essentially means 'phenomenon-like'.

Why does the first clause use the past tense (tuli) while the second uses the present tense (on)?

The tenses reflect the reality of the timeline. The band's rise to success happened in the past (tuli), but the members' talent is an ongoing, permanent characteristic, so it is expressed in the present tense (on). You do not have to force both verbs into the past tense just because the main clause is in the past.

Does jokainen (every/each) always take a singular verb and noun?