Complex sentence: The SB5 was developed so that different wing sweep angles could be assumed by the single aircraft, an assortment of tailplanes and wings were supplied and could be installed in order for their flight performance to be evaluated.
Split into simpler sentences: The SB5 was developed so that different wing sweep angles could be assumed by the single aircraft. An assortment of tailplanes and wings were supplied and could be installed in order for their flight performance to be evaluated.