Complex sentence: The western part, formerly facing the Neglinnaya River, is now part of the Alexander Garden, the bridge which previously crossed the river still stands and is done in the same style as the Kremlin wall.
Split into simpler sentences: The western part, formerly facing the Neglinnaya River, is now part of the Alexander Garden. The bridge which previously crossed the river still stands, and is done in the same style as the Kremlin wall.