Complex sentence: At a total length of, it connects the Albula Valley with the Engadin Valley, and, in so doing, passes under the watershed between the Rhine and the Danube a few kilometres west of the Albula Pass.
Split into simpler sentences: At a total length of, it connects the Albula Valley with the Engadin Valley. In so doing, it passes under the watershed between the Rhine and the Danube, a few kilometres west of the Albula Pass.