Complex sentence: It is believed to be the longest-running game show on television, trailing only the Spanish-language variety show "Sábado Gigante" (which will come to an end on September 19,2015).
Split into simpler sentences: It is believed to be the longest-running game show on television. The Spanish-language variety show "Sábado Gigante" (which will come to an end on September 19,2015).