Complex sentence: The vehicle was assembled by Podolsk Machine Factory named for S. Ordzhonikidze in July 1937 and successfully tested (85 bridge layings were performed and 70 tanks passed over the bridge); this ST-26 participated in military exercises of the Leningrad Military District in 1938.
Split into simpler sentences: The vehicle was assembled by the Podolsk Machine Factory named for S. Ordzhonikidze in July 1937 and successfully tested (85 bridge layings were performed and 70 tanks passed over the bridge). That ST-26 participated in military exercises of the Leningrad Military District in 1938.