Complex sentence: The tail unit is also of glassfibre/foam sandwich and the tailplane is an all-moving surface; the AS-W 19B has a tailplane and elevator, and air brakes on the upper wing only.
Split into simpler sentences: The tail unit is also of glassfibre/foam sandwich and the tailplane is an all-moving surface. The AS-W 19B has a tailplane and elevator, and air brakes on the upper wing only.