Complex sentence: In both cases, there are no elements subject to compression and the instability and buckling in tension is related to the presence of the slider, the junction between the two rods, allowing only relative sliding between the connected pieces.
Split into simpler sentences: In both cases, there are no elements subject to compression. The instability and buckling in tension is related to the presence of the slider, the junction between the two rods, allowing only relative sliding between the connected pieces.