Complex sentence: On 31 December 2009 Amtsbezirk Nidau, the municipality's former district, was dissolved and, the next day, joined the newly created Verwaltungskreis Biel/Bienne.
Split into simpler sentences: On 31 December 2009 Amtsbezirk Nidau, the municipality's former district, was dissolved. On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Biel/Bienne.