Complex sentence: There she collaborated with Solomon Berson to develop radioimmunoassay (RIA), a radioisotope tracing technique that allows the measurement of tiny quantities of various biological substances in human blood as well as a multitude of other aqueous fluids.
Split into simpler sentences: There she collaborated with Solomon Berson to develop radioimmunoassay (RIA). RIA is a radioisotope tracing technique that allows the measurement of tiny quantities of various biological substances in human blood as well as a multitude of other aqueous fluids.