Complex sentence: Although designed as a mailplane, a version to carry 22-passengers was developed the main difference was extra windows and slotted flaps in place of the split type and five of these made up the production order delivered in 1938/1939.
Split into simpler sentences: Although designed as a mailplane, a version to carry 22 passengers was developed; the main differences were extra windows and the presence of slotted flaps in place of the split type. Five of these made up the production order delivered in 1938/1939.