Complex sentence: The central part of the latter was a wooden airfoil section, span plane which contributed an extra 13% lifting area, with metal carriers at its ends, each supported by a pair of almost parallel struts to the lower fuselage.
Split into simpler sentences: The central part of the latter was a wooden airfoil section, span plane which contributed an extra 13% lifting area. This had metal carriers at its tips, each supported by a pair of almost parallel struts to the lower fuselage.