Complex sentence: The wing spars were rectangular duralumin tubes and the ribs were also duralumin The wings were fabric covered and their outer trailing edges carried narrow chord unbalanced ailerons over half the span.
Split into simpler sentences: The wing spars were rectangular duralumin tubes and the ribs were also duralumin; the wings were fabric covered. The outer trailing edges carried narrow chord unbalanced ailerons over half the span.