Complex sentence: It runs from Zürich Hauptbahnhof and heads for Langnau-Gattikon and Sihlwald; the line is operated by the Sihltal Zürich Uetliberg Bahn (SZU) in the Sihl Valley.
Split into simpler sentences: It runs from Zürich Hauptbahnhof to Langnau-Gattikon and Sihlwald. The line is operated by the Sihltal Zürich Uetliberg Bahn (SZU) in the Sihl Valley.