Original sentence: As a rush job intended to be brought from design to production in a short period, the M3 was well armed and armored for the period, but due to various shortcomings (high silhouette, archaic sponson mounting of the main gun, below average off-road performance) it was not competitive and was withdrawn from front line duty as soon as the M4 Sherman became available in large numbers
Edited sentence: However, as a rush job intended to be brought from design to production in a short period, it suffered various shortcomings such as a high silhouette, archaic sponson mounting of the main gun, and below average off-road performance.The M3 was relatively well armed and armored for the period.The prototype of the M4 Sherman which replaced the Lee would add a modern turret to a modified Lee hull and chassis