Complex sentence: Co-owned WVUV (AM) had been established during WWII and was "grandfathered" with a W-call, and the FCC allowed Channel 30 to use a "conforming" call (WVUV-LP).
Split into simpler sentences: Co-owned WVUV (AM) was established during WWII and was "grandfathered" with a W-call. The FCC allowed Channel 30 to use a "conforming" call (WVUV-LP).