Learn Swedish: Svår som den var, botade terapin klaustrofobin. - Difficult as it was, the therapy cured the claustrophobia.

This is a fronted predicative concessive clause. By putting the adjective Svår first, followed by som and then the subject and verb den var, you create a structure that translates to "Even though it was difficult" or "Difficult as it was". It emphasizes the adjective to highlight a contrast with the positive result in the main clause.

Why does the main clause start with the verb botade instead of the subject terapin?

Swedish strictly follows the V2 rule, meaning the finite verb must be in the second position of a main clause. The entire introductory phrase Svår som den var acts as the first block of information, so the verb botade must come next, forcing the subject terapin into the third position.

Why do we use Svår and den in the first clause instead of svårt and det?

The pronoun den refers to the subject of the main clause, terapin, which is an en-word. Because it refers to an en-word, the adjective must also be in its basic common-gender form, Svår. If the sentence were about an ett-word like projektet, it would be Svårt som det var.

Why does the Swedish sentence use the definite form klaustrofobin?