wobei

German edit

wobei

Introduces a comitative sentence, denoting a simultaneous event with the main clause. It frequently corresponds to English present participles (-ing) in adverbial use.
"Nein, bitte nicht", wehrte Bernie schnell ab, wobei er zugleich seine Rechte über das Glas hielt.
"No, please don't," Bernie quickly defended himself, holding his right hand over the glass at the same time.

Das Auto prallte gegen einen Baum, wobei der Fahrer schwer verletzt wurde.
The car hit a tree severely injuring the driver.
Interrogative and relative adverbs: by what, about what
Wobei ist er gestört worden?
What was he disturbed by?

Mach nur das, wobei du Leidenschaft entwickelst
Only do what you are passionate about.
(colloquial) Sometimes with verb in the second position. With concessive meaning when main and subordinate clauses are semantically incompatible.
Er lacht nie, wobei er seine Zähne wirklich nicht verstecken muss.
He never laughs, although he really doesn't have to hide his teeth.