Complex sentence: The War Department worked with Clark over the course of 1942 and into 1943 ordering many CA-1s by wars end it is estimated that there were more than 2,500 produced.
Split into simpler sentences: The War Department worked with Clark over the course of 1942 and into 1943 ordering many CA-1s by wars end. It is estimated that there were more than 2,500 produced.