Complex sentence: Later that year, he faced a combined Austrian and Russian force on September 27, when Gazan repulsed Russian outposts at the Limmat river and participated in the wild pursuit of the Austrians in the Second Battle of Zürich, resulting in a decisive French victory.
Split into simpler sentences: Later that year, he faced a combined Austrian and Russian force at the Second Battle of Zürich (27 September). He subsequently participated in the wild pursuit of the Austrians, resulting in a decisive French victory.