Original sentence: After World War II most US Army armored units were equipped with a mix of M4 Sherman and M26 Pershing tanks.Designed initially as a heavy tank the M26 Pershing tank was reclassified as a medium tank) postwar.The M26 was a significant improvement over the M4 Sherman in firepower and protection
Edited sentence: After World War II US Army had numerous armoured forces with experienced commanders.Designed initially as a heavy tank (in May 1946, due to the changing conception of the US Army's tank needs, the M26 Pershing tank was reclassified as a medium tank), Pershing was a significant improvement over the M4 Sherman in firepower and protection.However it lacked modern weapons.Most of US armoured units were equipped with M4 Sherman tanks which didn't stand a chance against latest of German World War II tanks as well as Soviet tanks that went into production shortly before the end of the war