Original sentence: Formally before the merger between ASCP and the National Credentialing Agency for Laboratory Personnel (NCA), Medical Laboratory Scientist certified by (ASCP) were entitled to use the credential "MT" (for Medical Technologist)   and if credentialed by the (NCA), the credential "CLS" (Clinical Laboratory Scientist) was used
Edited sentence: Formally before the merger between ASCP and the National Credentialing Agency for Laboratory Personnel (NCA), Medical Laboratory Scientist certified by (ASCP) were entitled to use the credential "MT" (for Medical Technologist)   and if credentialed by (NCA), the credential "CLS" (Clinical Laboratory Scientist) was used