Complex sentence: Some countries have already replaced their traditional bank account scheme by IBAN, this includes Switzerland which introduced the IBAN for national credit transfer on 1 January 2006 and the support for the old bank account numbers is not required from 1 January 2010.
Split into simpler sentences: Some countries have already replaced their traditional bank account scheme by IBAN. This includes Switzerland where IBAN was introduced for national credit transfer on 1 January 2006 and the support for the old bank account numbers has not been required from 1 January 2010.