Complex sentence: The Milchbuck Tunnel is a motor road tunnel in Switzerland, and forms part of the A1L motorway from Zürich Schwamendingen to Zürich Letten, where the tunnel's southern portal lies on Wasserwerkstrasse, which leads into central Zürich.
Split into simpler sentences: The Milchbuck Tunnel is a motor road tunnel in Switzerland, and forms part of the A1L motorway from Zürich Schwamendingen to Zürich Letten. The southwestern end lies on Wasserwerkstrasse, which leads into central Zürich.