Complex sentence: The experiment is usually performed at synchrotron radiation facilities, which provide intense and tunable X-ray beams, and samples can be in the gas-phase, solution, or condensed matter (ie. solids).
Split into simpler sentences: The experiment is usually performed at synchrotron radiation sources, which provide intense and tunable X-ray beams. Samples can be in the gas-phase, solution, or condensed matter (ie. solids).