Complex sentence: This was, at least, public opinion in the mid- 90s, when widescreen TV first arrived, but letterboxing and pillarboxing is much more accepted by the public, production techniques have yet to change to reflect this.
Split into simpler sentences: This was, at least, public opinion in the mid- 90s, when widescreen TV first arrived, but letterboxing and pillarboxing is now much more accepted by the public. Nonetheless production techniques have yet to change to reflect this.