bovendien means “moreover”. When it opens the clause, the verb comes before the subject (inversion).
Connective adverbs · Bijwoorden
Het is goedkoop. Bovendien is het lekker.
It's cheap. Moreover, it's tasty.
Ze is aardig. Bovendien werkt ze hard.
She is nice. Moreover, she works hard.
Drag scrambled words into the right Dutch order and master inversion and the verb-final rule.