Learn Swedish: Publiken tittade inte ens på den oförberedda jonglören. - The audience did not even look at the unprepared juggler.

In a main clause, Swedish follows the V2 (verb-second) rule. Sentence adverbials normally come immediately after the finite verb. Because inte ens acts together as a single negative unit here, it takes the standard spot of inte to modify the action, showing they didn't do so much as look.

Could we move inte ens to the start of the sentence?

Yes, but it changes the meaning! The particle inte ens is placed right before the specific part of the sentence it modifies. If you write Inte ens publiken tittade på..., it means "Not even the audience looked at..." which shifts the negative focus to the audience rather than the act of looking.

What if this was a subordinate clause, like "jag hörde att..." (I heard that...)? Where would inte ens go?

In a subordinate clause, sentence adverbials come before the finite verb, following the BIFF rule. You would write: ...att publiken inte ens tittade på den oförberedda jonglören.

Why does the word oförberedda end in an "-a"?

Oförberedd (unprepared) is a past participle acting as an adjective. Because the phrase is definite (the unprepared juggler), Swedish requires double definiteness. You need the independent article den, the definite -a ending on the adjective, and the definite suffix -en on the noun jonglören.