Complex sentence: On September 18, The CW debuted on "WBFW" which began using the WPTA-DT2 calls in an official manner and became known on-air as "Fort Wayne's CW".
Split into simpler sentences: On September 18, The CW debuted on "WBFW" (which became officially known as having the WPTA-DT2 calls). The station then became known on-air as "Fort Wayne's CW".