Original: He was a member of the Bundestag from 1975 to 1992 and again since 1998; from 1995 to 1998 he was a member of the Landtag (state parliament) of North Rhine-Westphalia.
Simplified: He was member of the Bundestag (Federal Parliament) from 1974 to 1992 and has been member again since 1998.