Complex sentence: Since the 2014 municipal elections, therefore, the Amsterdam district councils have seized to exist and were replaced under a municipal ordinance by smaller, but still directly elected district committees ("bestuurscommissies").
Split into simpler sentences: Since the 2014 municipal elections, therefore, the Amsterdam district councils have seized to exist. Under a municipal ordinance, however, they were replaced by smaller, but still directly elected district committees ("bestuurscommissies").