Complex sentence: In 1996 he was elected to the Italian Chamber of Deputies (lower house of the Italian Parliament); while in 1999 he was elected to the European Parliament, of which he stayed member until 2004.
Split into simpler sentences: In 1996 he was elected to the Italian Chamber of Deputies (lower house of the Italian Parliament). In 1999 he was elected to the European Parliament, of which he stayed member until 2004.