Complex sentence: By December 1971 the tooling for the new fuselage was in development, also featuring a longer and more "pointy" nose, whereas the "N500BD" was somewhat "egg shaped", patterned on the Schleicher ASW 15.
Split into simpler sentences: By December 1971 the tooling for the new fuselage was in development. The aircraft now featured a longer and pointier nose, whereas the "N500BD" was somewhat "egg shaped", patterned on the Schleicher ASW 15.