Complex sentence: At the rear the empennage was conventional, with a narrow chord, rectangular tailplane mounting broader, blunt ended, balanced, separate elevators' It much larger, rounded vertical tail had a broad-chord fin and generous, balanced rudder which extended to the keel.
Split into simpler sentences: At the rear the empennage was conventional, with a narrow chord, rectangular tailplane mounting broader, blunt ended, balanced, separate elevators. Its much larger, rounded vertical tail had a broad-chord fin and generous, balanced rudder which extended to the keel.