Complex sentence: On the 1st October 2012, the Chiltern Air Support Unit was taken over by the newly created National Police Air Service.Only the Benson staff employed by the Chiltern Air Support Unit were seconded to West Yorkshire Police, who are the lead force for the NPAS.
Split into simpler sentences: On the 1st October 2012, the Chiltern Air Support Unit was merged into the newly created National Police Air Service. All staff employed by the Chiltern Air Support Unit were seconded to West Yorkshire Police, who are the lead force for the NPAS.