Complex sentence: Borusewicz was a democratic opposition activist under the Communist regime, a member of the Polish parliament (Sejm) for three terms and first Senate Speaker to serve two terms in this office.
Split into simpler sentences: Borusewicz was a democratic opposition activist under the Communist regime, and a member of the Polish parliament (Sejm) for three terms. He is notable for being the first Senate Speaker to serve two terms in this office.