Complex sentence: He grew up and attended local schools in Brockton, MA and during WWII, was a B-17 Flying Fortress flight instructor for the USAF at Lackland AFB.
Split into simpler sentences: He grew up and attended local schools in Brockton, Massachusetts. During WWII, Cottle was a B-17 Flying Fortress flight instructor for the USAF at Lackland AFB.