Complex sentence: David Puente was also responsible for writing the first Spanish-language articles ever published on ABCNews.com, and began a weekly ABC News segment on Spanish-language radio, which also had never before existed in network news.
Split into simpler sentences: David Puente was also responsible for writing the first Spanish-language articles ever published on ABCNews.com. He also began a weekly ABC News segment on Spanish-language radio, which also had never before existed in network news.