Complex sentence: Initially traveling by ship from the east coast to Casablanca, French Morocco, once the squadrons planes were assembled and checked out, the unit flew east to Cairo, Egypt, where they expected orders for Poltava Airfield, Ukraine on the Soviet Eastern Front.
Split into simpler sentences: Initially traveling by ship from the east coast to Casablanca, French Morocco. Once the squadrons' planes were assembled and checked out, the unit flew east to Cairo, Egypt, where they expected orders for Poltava Airfield, Ukraine on the Soviet Eastern Front.