daardoor means “as a result”. When it opens the clause, the verb comes before the subject (inversion).
Connective adverbs · Bijwoorden
Het sneeuwde. Daardoor was de weg glad.
It snowed. As a result the road was slippery.
Hij oefent veel. Daardoor gaat het beter.
He practises a lot. As a result it's going better.
Drag scrambled words into the right Dutch order and master inversion and the verb-final rule.