Complex sentence: On 25 November 2001 he was chosen as party leader for the LN, which functioned as the national extension of a movement that had contested local elections in various municipalities before, but never national elections.
Split into simpler sentences: On 25 November 2001 he was chosen as party leader for the LN. The LN functioned as the national extension of a movement that had contested local elections in various municipalities before, but never national elections.