Complex sentence: Playtex was the first to advertise undergarments on national television in 1955 and the first to take advantage of relaxed regulation by the National Association of Broadcasters by showing a woman's top half wearing only a bra in a 1985 advertisement.
Split into simpler sentences: Playtex was the first to advertise undergarments on national television in 1955. It was also the first to take advantage of relaxed regulations by the National Association of Broadcasters by showing a woman's top half wearing only a bra in a 1985 advertisement.