Complex sentence: Mounted on the lower fuselage with about 4 ° of dihedral, they were built around two box spars with spruce ribs, fabric covered and each braced from the floats by converging pairs of duralumin tubular struts to a little beyond mid-span.
Split into simpler sentences: Mounted on the lower fuselage with about 4 ° of dihedral, they were built around two box spars with spruce ribs and fabric covered. Each wing was braced from the floats by converging pairs of duralumin tubular struts to a little beyond mid-span.