Complex sentence: Although Television have never had more than a cult audience in their American homeland, they have achieved significant commercial success in Europe, and today are widely regarded as one of the key founders of, and seminal influences on, punk rock.
Split into simpler sentences: Although Television have never had more than a cult audience in their American homeland, they have achieved significant commercial success in Europe. Today, they are widely regarded as one of the key founders of, and seminal influences on punk rock.