Complex sentence: Tibor Kálmán was a member of Alliance Graphique Internationale (AGI) and one of the 33 signers of the First Things First 2000 manifesto.
Split into simpler sentences: Tibor Kálmán was a member of Alliance Graphique Internationale (AGI). Kalman was one of the 33 signers of the First Things First 2000 manifesto.