Complex sentence: The Norélic had a two blade articulated rotor with undamped flapping hinges; the blades had the same chord and aerofoil from hub to tip and were each built around a single solid spar with ribs and a thin metal skin, all clamped together.
Split into simpler sentences: The Norélic had a two blade articulated rotor with undamped flapping hinges. The blades had the same chord and aerofoil from hub to tip and were each built around a single solid spar with ribs and a thin metal skin all clamped together.