Complex sentence: While at UCD he was an avid Gaeilgeoir (Irish speaker) heavily involved in the students union while he also served as auditor of the prestigious Commerce and Economic Society (his predecessors included Charlie Haughey and Fergal Quinn).
Split into simpler sentences: While at UCD he was an avid Gaeilgeoir (Irish speaker) heavily involved in the students union. He also served as auditor of the prestigious Commerce and Economic Society (his predecessors included Charlie Haughey and Fergal Quinn).