Complex sentence: He was also provincial chairman of Socialist Youth Vienna (Sozialistische Jugend Wien) from 1985 until 1994, when he became a member of the Viennese state parliament and municipal council; where he held various positions concerning housing construction and urban renewal.
Split into simpler sentences: He was also provincial chairman of the Socialist Youth Vienna (Sozialistische Jugend Wien) from 1985 until 1994. Subsequently, he became a member of the Viennese state parliament and municipal council, where he held various positions concerning housing construction and urban renewal.