Complex sentence: He experimented on long brittle cylinders, longitudinally-clamped by novel stress wave scattering confinements composed of high strength alloys in order to minimize the effects of the reflected waves so that the analysis of results would be limited to the incident waves.
Split into simpler sentences: He experimented on long brittle cylinders, longitudinally-clamped by novel stress wave scattering confinements composed of high strength alloys. He designed the confinements this way in order to minimize the effects of the reflected waves so that the analysis of experimental results would be limited to the incident waves.