Complex sentence: Its first broadcast was on May 16,1954 as WGAN-TV, owned by Guy Gannett Communications along with WGAN-AM 560 and the "Portland Press-Herald".
Split into simpler sentences: Its first broadcast was on May 16,1954 under the call sign of WGAN-TV. It was owned by Guy Gannett Communications along with WGAN-AM 560 and the "Portland Press-Herald".