Complex sentence: The country's government television network began operations in 1974 as Government Television (GTV-4) thru the National Media Production Center, it was the headed by Lito Gorospe and then-Press Secretary during Marcos administration, Francisco Tatad.
Split into simpler sentences: The country's government television network began operations in 1974 as Government Television (GTV-4) thru the National Media Production Center. The nascent channel was at first headed by Lito Gorospe and later by the then-Press Secretary during the Marcos administration, Francisco Tatad.