Complex sentence: Squadrons 2, and 3 had already been shipped overseas, and Squadrons 4, and 5 were dissolved almost as quickly as thay were formed, only 35 companies made it to France with the American Expeditionary Force (AEF).
Split into simpler sentences: Squadrons 2, and 3 had already been shipped overseas, while Squadrons 4 and 5 were dissolved almost as quickly as they were formed. Only 35 companies made it to France with the American Expeditionary Force (AEF).