Complex sentence: This route, the "Highline", joined the Oakland-Salt Lake City main line at the Keddie Wye, a unique combination of two steel trestles and a tunnel forming a triangle of intersecting track.
Split into simpler sentences: This route, called the "Highline", joined the Oakland-Salt Lake City mainline at a junction known as the Keddie Wye. Considered the heart of the railroad, this unique structure featured two steel trestles and a tunnel, all forming a triangle of intersecting track.