Complex sentence: The FCC authorized the station that would become WMMW (AM) on October 8,1945, and during the week of December 31,1945-January 4,1946, it authorized WMMW-FM, the station that would become WKSS 25 years later.
Split into simpler sentences: The FCC authorized the station that would become WMMW (AM) on October 8,1945. And during the week of December 31,1945-January 4,1946, it authorized WMMW-FM, the station that would become WKSS 25 years later.