Complex sentence: The two were merged into one station with the W2XOY call-letters on November 20,1940 with the station then taking the W57A designation, and finally the long-running WGFM call-letters in the mid- 1940s.
Split into simpler sentences: The two were merged into one station with the W2XOY call-letters on November 20,1940. The station then adopted the W57A designation, and finally the long-running WGFM call-letters in the mid- 1940s.