Complex sentence: Rapid pressure swing adsorption or RPSA is frequently used in portable oxygen concentrators as it allows a significant reduction in the size of the adsorbent bed when very high purity is not essential and feed gas can be discarded.
Split into simpler sentences: Rapid pressure swing adsorption or RPSA is frequently used in portable oxygen concentrators. It allows a significant reduction in the size of the adsorbent bed when high purity is not essential and feed gas can be discarded.